INTERACTIVE INTELLIGENCE INC
424B4, 1999-09-23
PREPACKAGED SOFTWARE
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<PAGE>
P_R_O_S_P_E_C_T_U_S
                                2,670,000 SHARES

                                     [LOGO]

                         INTERACTIVE INTELLIGENCE, INC.
                                  COMMON STOCK
                                 --------------

    This is Interactive Intelligence's initial public offering of common stock.
The underwriters will offer 2,670,000 shares in the United States and Canada.
    Currently, no public market exists for the shares. The common stock has been
approved for quotation on the Nasdaq National Market under the symbol "ININ."

    INVESTING IN THE COMMON STOCK INVOLVES RISKS WHICH ARE DESCRIBED IN THE
"RISK FACTORS" SECTION BEGINNING ON PAGE 7 OF THIS PROSPECTUS.
                               -----------------

<TABLE>
<CAPTION>
                                                                PER SHARE       TOTAL
                                                               -----------  -------------
<S>                                                            <C>          <C>
Public offering price........................................    $13.00      $34,710,000

Underwriting discount........................................     $.91       $2,429,700

Proceeds, before expenses, to Interactive Intelligence.......    $12.09      $32,280,300
</TABLE>

    The underwriters may also purchase up to an additional 330,500 shares from
us and 70,000 shares from one of our stockholders at the public offering price,
less the underwriting discount, within 30 days from the date of this prospectus
to cover over-allotments.

    At our request, the underwriters have reserved up to 7% of the shares of our
common stock offered by this prospectus for sale, at the initial public offering
price, to some of our employees, executive officers, directors and resellers and
to some individuals designated by them. The number of shares of common stock for
sale to the general public in this offering will be reduced to the extent those
persons purchase the reserved shares.

    Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined if this
prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.

    The shares of common stock will be ready for delivery in New York, New York
on or about September 28, 1999.

                               ------------------
MERRILL LYNCH & CO.

              HAMBRECHT & QUIST

                             U.S. BANCORP PIPER JAFFRAY
                               ------------------

               THE DATE OF THIS PROSPECTUS IS SEPTEMBER 22, 1999.
<PAGE>
                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Prospectus Summary.........................................................................................          3

Forward-Looking Statements.................................................................................          7

Risk Factors...............................................................................................          7

Use of Proceeds............................................................................................         18

Dividend Policy............................................................................................         18

Capitalization.............................................................................................         19

Dilution...................................................................................................         20

Selected Consolidated Financial Data.......................................................................         21

Management's Discussion and Analysis of Financial Condition and Results of Operations......................         22

Business...................................................................................................         32

Management.................................................................................................         47

Executive Compensation.....................................................................................         51

Certain Transactions.......................................................................................         58

Principal and Selling Stockholders.........................................................................         60

Description of Capital Stock...............................................................................         61

Shares Eligible for Future Sale............................................................................         65

Underwriting...............................................................................................         67

Legal Matters..............................................................................................         70

Experts....................................................................................................         70

Additional Information.....................................................................................         70

Index to Consolidated Financial Statements.................................................................        F-1
</TABLE>

                            ------------------------

    YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN THIS PROSPECTUS. WE
HAVE NOT, AND THE UNDERWRITERS HAVE NOT, AUTHORIZED ANY OTHER PERSON TO PROVIDE
YOU WITH DIFFERENT INFORMATION. IF ANYONE PROVIDES YOU WITH DIFFERENT OR
INCONSISTENT INFORMATION, YOU SHOULD NOT RELY ON IT. WE ARE NOT, AND THE
UNDERWRITERS ARE NOT, MAKING AN OFFER TO SELL THESE SECURITIES IN ANY
JURISDICTION WHERE THE OFFER OR SALE IS NOT PERMITTED.

                                       2
<PAGE>
                               PROSPECTUS SUMMARY

    THIS SUMMARY HIGHLIGHTS SELECTED INFORMATION FROM THIS PROSPECTUS. TO
UNDERSTAND THIS OFFERING FULLY, YOU SHOULD READ THE ENTIRE PROSPECTUS CAREFULLY,
INCLUDING THE RISK FACTORS AND THE FINANCIAL STATEMENTS AND RELATED NOTES,
BEFORE YOU DECIDE WHETHER TO INVEST IN OUR COMMON STOCK.

OUR COMPANY

    We are a leading developer of enterprise software that allows our customers
to automate virtually every aspect of their business communications. When
installed on a Windows NT-Registered Trademark- server, our flagship product,
Enterprise Interaction Center-Registered Trademark- or EIC, provides a single,
integrated solution capable of processing thousands of interactions per hour,
including telephone calls, e-mails, faxes, voice mail messages, Internet chat
sessions, Web callback requests and voice over Net calls. EIC is a unique
software solution that replaces a variety of traditional devices such as private
branch exchange devices or PBXs, interactive voice response systems or IVRs,
automatic call distributors or ACDs, voice mail systems, fax servers, call
recorders and computer telephony integration or CTI gateways. We began licensing
our products in 1997 and have grown our total revenues from $1.6 million in 1997
to $9.0 million in 1998.

OUR INDUSTRY

    Due to a broad combination of factors, including deregulation, consolidation
and advances in technology, organizations are looking to communications
technology to increase efficiency and provide better service. We believe we are
well positioned to take advantage of the following major trends taking place
within many industries.

    - GROWTH OF CALL CENTERS. To consolidate customer contact points and focus
      on customer service, organizations are frequently implementing formal call
      centers. We believe that the market for call center communications
      products in 1998 represented approximately 55% of the estimated $10.0
      billion computer telephony industry, and we expect this market to grow at
      25% to 30% annually.

    - INCREASING VARIETY AND COMPLEXITY OF BUSINESS COMMUNICATIONS. In addition
      to more traditional communications media such as telephone, fax and voice
      mail, the growth of the Internet has expanded the number and complexity of
      business communications to include e-mail, Internet chat sessions, Web
      callback requests and voice over Net calls. We believe that approximately
      one-fifth of customer contact will shift from the phone to the Internet in
      the next two years.

    - INCREASING NEED TO INTEGRATE BUSINESS COMMUNICATIONS AND COMPUTER
      SYSTEMS. Historically, telecommunications systems and information systems
      have been separate and distinct. To more effectively and efficiently
      interact, both internally and externally, enterprises need to seamlessly
      access and utilize these two systems.

    - ENTRANCE OF NEW SERVICE PROVIDERS. The Telecommunications Act of 1996
      deregulated many aspects of the communications market and resulted in a
      rapid increase in the number and types of organizations seeking to provide
      communications and other services. These new service provider entrants
      include local exchange carriers, cable companies, Internet service
      providers and wireless companies.

    We believe the traditional multi-device approach to communications by
organizations is inadequate to address the needs created by these trends. We
believe the shortcomings of this approach create a significant opportunity for a
single, all-in-one solution based on standard hardware and software technology
that enables organizations to efficiently and effectively interact with all of
their constituents.

                                       3
<PAGE>
OUR SOLUTION

    We believe that EIC provides our end-user customers with an all-in-one
communications solution that has the following advantages over the traditional
multi-device approach:

    - BROADER RANGE OF FUNCTIONS. Unlike traditional systems that require
      end-user customers to purchase separate products to attain broader
      functionality, EIC is an all-in-one system that offers a broad suite of
      communications features.

    - REDUCED NEED TO INTEGRATE DISPARATE TECHNOLOGIES. EIC pre-assembles all
      the necessary components into one software solution, allowing end-user
      customers to concentrate their efforts on improving business operations.

    - OPEN ARCHITECTURE AND BETTER COMPATIBILITY WITH LEADING TECHNOLOGIES. Our
      products are built around industry standard hardware and software
      components such as Intel microprocessors and the Microsoft Windows
      NT-Registered Trademark- operating system.

    - LOWER TOTAL COST OF OWNERSHIP. EIC's capabilities reside in a single
      Windows NT-Registered Trademark- server, resulting in a lower total cost
      of ownership due to the reduced time and expense typically required to
      maintain a centralized software-based communications system.

    - GREATER ABILITY TO CUSTOMIZE COMMUNICATIONS TO MEET SPECIFIC NEEDS. While
      EIC can be deployed quickly with minimal configuration, organizations can
      also customize many aspects of their communications processing using EIC's
      graphical application generator.

OUR CUSTOMERS

    We design our software to meet the needs of end-user customers in three
growing markets: call centers, enterprises and service providers. We license our
products to over 300 end-user customers, including Ameritech Corporation,
BuyItNow, Inc., Deutsche Telekom Berkom Gmbh, Seagate Technology, Inc. and
Toshiba America Consumer Products. We market our software products and services
through an extensive distribution network consisting of over 100 independent
resellers in North America, Europe and the Asia/Pacific region. Our resellers
range from relatively small, local organizations to large regional and national
firms, such as Bell South Communication Systems, Inc. and KPN Telecom B.V. We
also provide our end-user customers and resellers with technical support,
educational and professional services.

OUR GROWTH STRATEGY

    Our primary business objective is to become the leading vendor of enterprise
software that allows call centers, enterprises and service providers to automate
virtually every aspect of their business communications. Our strategy for
achieving this objective incorporates the following key elements:

    - CONTINUE TO EXPAND OUR LEADING TECHNOLOGY POSITION. We have significant
      technical expertise in call center, communications and software
      technologies. We intend to use our expertise to add new features to our
      products, improve the ability of our current and future products to handle
      the needs of larger organizations, and broaden the compatibility of our
      products to work with other systems and applications used by our
      customers.

    - BROADEN OUR PRODUCT OFFERING. We plan to broaden our product offering with
      additional products and features for our target markets.

    - FURTHER EXPAND OUR GLOBAL DISTRIBUTION CHANNEL. We plan to further expand
      our existing distribution channel, which currently consists of over 100
      resellers in more than 20 countries.

    - DEVELOP OUR STRATEGIC BUSINESS RELATIONSHIPS. We have strategic
      relationships with leading technology companies, including Microsoft
      Corporation, which recently recognized us as the

                                       4
<PAGE>
      ninth fastest growing independent software vendor using Microsoft
      Windows-Registered Trademark-. In addition to our relationships with
      technology companies, we intend to pursue strategic relationships with
      network equipment vendors as well as developers of customer relationship
      management software.

OUR ADDRESS

    We are incorporated in Indiana, and our worldwide headquarters are located
at 8909 Purdue Road, Suite 300, Indianapolis, Indiana 46268. Our telephone
number is (317) 872-3000, and our Web site is www.inter-intelli.com. The
information on our Web site is not part of this prospectus.

THE OFFERING

    Unless stated otherwise, all financial information and share and per share
data in this prospectus
    - give effect to the three-for-two stock split that was effected on July 12,
      1999;

    - assume that the underwriters do not exercise their over-allotment option;
      and

    - do not include shares reserved for issuance under our stock option plans.

Our common stock outstanding after the offering includes shares issuable upon
the exercise of options outstanding under our stock option plans. As of June 30,
1999, there were 2,256,954 shares issuable upon the exercise of outstanding
options, of which 404,604 were exercisable, and 3,676,875 shares available for
future awards of options under these plans. See "Executive Compensation--Stock
Option Plans" and "Underwriting."

<TABLE>
<S>                                            <C>
Common stock offered.........................  2,670,000 shares
Common stock outstanding after the             13,370,121 shares
  offering...................................
Use of proceeds..............................  For general corporate purposes, including
                                               working capital and potential acquisitions,
                                               for repayment of lines of credit and for
                                               repayment of indebtedness and payment of
                                               deferred compensation and other non-interest
                                               bearing accounts payable to our principal
                                               stockholder. See "Use of Proceeds."
Risk factors.................................  See "Risk Factors" for a discussion of
                                               factors you should carefully consider before
                                               deciding whether to invest in shares of our
                                               common stock.
Nasdaq National Market symbol................  ININ
</TABLE>

                                       5
<PAGE>
                   SUMMARY CONSOLIDATED FINANCIAL INFORMATION
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)

    THE FOLLOWING TABLE SUMMARIZES THE FINANCIAL INFORMATION FOR INTERACTIVE
INTELLIGENCE. YOU SHOULD READ THIS INFORMATION WITH THE FINANCIAL STATEMENTS AND
NOTES TO THE FINANCIAL STATEMENTS APPEARING ELSEWHERE IN THIS PROSPECTUS. SEE
"MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF
OPERATIONS." THE AS ADJUSTED CONSOLIDATED BALANCE SHEET DATA REFLECT APPLICATION
OF THE ESTIMATED NET PROCEEDS FROM THE SALE OF 2,670,000 SHARES IN THIS
OFFERING, AT THE INITIAL PUBLIC OFFERING PRICE OF $13.00 PER SHARE LESS
UNDERWRITING DISCOUNTS OF $2.4 MILLION AND ESTIMATED EXPENSES OF $750,000, AS
DESCRIBED IN "USE OF PROCEEDS."
<TABLE>
<CAPTION>
                                                                                                         SIX MONTHS
                                    OCTOBER 1, 1994             YEAR ENDED DECEMBER 31,                ENDED JUNE 30,
                                    (INCEPTION) TO     ------------------------------------------  ----------------------
                                   DECEMBER 31, 1994     1995       1996       1997       1998       1998        1999
                                  -------------------  ---------  ---------  ---------  ---------  ---------  -----------
<S>                               <C>                  <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenues:
  Software......................       $      --       $      --  $      --  $   1,265  $   7,662  $   2,980   $   5,482
  Services......................              --              --         --        325      1,349        407       1,826
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Total revenues..................              --              --         --      1,590      9,011      3,387       7,308
Costs and expenses:
  Costs of software.............              --              --         --         38         59         24          60
  Costs of services.............              --              --         --      1,258      3,381      1,387       2,360
  Sales and marketing...........              --              19        157      2,519      6,623      2,715       4,553
  Research and development......               8             297        987      2,118      4,065      1,837       3,004
  General and administrative....              --              99        192        742      1,407        590       1,135
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Total costs and expenses........               8             415      1,336      6,675     15,535      6,553      11,112
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Operating loss..................              (8)           (415)    (1,336)    (5,085)    (6,524)    (3,166)     (3,804)
Interest expense, net...........              --               1         43        361        868        428         398
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Loss before income taxes........              (8)           (416)    (1,379)    (5,446)    (7,392)    (3,594)     (4,202)
Income taxes....................              --              --         --         --         --         --          --
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Net loss........................       $      (8)      $    (416) $  (1,379) $  (5,446) $  (7,392) $  (3,594)  $  (4,202)
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
                                          ------       ---------  ---------  ---------  ---------  ---------  -----------
Basic and diluted net loss per
  share.........................       $   (0.01)      $   (0.21) $   (0.33) $   (0.71) $   (0.84) $   (0.44)  $   (0.40)
Shares used in per share
  computation...................           1,500           1,966      4,216      7,642      8,816      8,203      10,538

<CAPTION>

                                                                                                      AT JUNE 30, 1999
                                                                                                   ----------------------
                                                                                                    ACTUAL    AS ADJUSTED
                                                                                                   ---------  -----------
<S>                               <C>                  <C>        <C>        <C>        <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash and cash equivalents......................................................................  $      87     $22,666
  Working capital (deficit)......................................................................     (3,167)     20,467
  Total assets...................................................................................      7,798      30,377
  Long-term debt.................................................................................      8,523         627
  Total shareholders' equity (deficit)...........................................................     (7,997)     23,533
</TABLE>

                                       6
<PAGE>
                           FORWARD-LOOKING STATEMENTS

    This prospectus contains forward-looking statements that reflect our views
about future events and financial performance. Forward-looking statements are
subject to known and unknown risks, uncertainties and other factors that may
cause our and our industry's actual results, levels of activity, performance,
achievements and prospects to be materially different from those expressed or
implied by those forward-looking statements. These risks, uncertainties,
assumptions and other factors include, among others, those identified under
"Risk Factors" and elsewhere in this prospectus. In light of these risks,
uncertainties and assumptions, the forward-looking events discussed in this
prospectus might not occur. In addition, actual results could differ materially
from those suggested by the forward-looking statements, and therefore you should
not place undue reliance on the forward-looking statements.

                                  RISK FACTORS

    INVESTING IN OUR COMMON STOCK WILL PROVIDE YOU WITH AN EQUITY OWNERSHIP IN
INTERACTIVE INTELLIGENCE. AS AN INTERACTIVE INTELLIGENCE STOCKHOLDER, YOU MAY BE
SUBJECT TO RISKS INHERENT IN OUR BUSINESS. THE PERFORMANCE OF YOUR SHARES WILL
REFLECT THE PERFORMANCE OF OUR BUSINESS RELATED TO, AMONG OTHER THINGS, OUR
COMPETITION, GENERAL ECONOMIC AND MARKET CONDITIONS AND INDUSTRY CONDITIONS. THE
PRICE OF OUR COMMON STOCK MAY DECLINE AND THE VALUE OF YOUR INVESTMENT COULD
DECREASE. YOU SHOULD CAREFULLY CONSIDER THE FOLLOWING FACTORS AS WELL AS OTHER
INFORMATION CONTAINED IN THIS PROSPECTUS BEFORE DECIDING WHETHER TO INVEST IN
SHARES OF OUR COMMON STOCK.

OUR LIMITED OPERATING HISTORY MAKES FINANCIAL FORECASTING DIFFICULT AND, IN
ASSESSING OUR PROSPECTS, YOU SHOULD CONSIDER OUR EARLY STAGE OF DEVELOPMENT AND
PRESENCE IN A NEW AND RAPIDLY EVOLVING INDUSTRY

    Our limited operating history makes it difficult to forecast our future
operating results. We commenced operations in October 1994, but did not begin
shipping our principal product, Enterprise Interaction Center or EIC, until
March 1997. Accordingly, you should assess our prospects in light of the risks
and difficulties frequently encountered by companies in the early stage of
development, particularly companies in new and rapidly evolving industries.

WE HAVE HISTORICALLY INCURRED LOSSES AND WE MAY NOT ACHIEVE PROFITABILITY

    We have not operated profitably to date. We incurred net losses of $7.4
million in 1998 and $4.2 million for the six-month period ended June 30, 1999.
At June 30, 1999, we had accumulated losses since inception of $18.8 million. We
intend to continue to make significant investments in our research and
development, marketing, services and sales operations. We anticipate that these
expenses could significantly precede any revenues generated by the increased
spending. As a result, we are likely to continue to experience losses and
negative cash flow from operations in future quarters. If we do become
profitable, we may not sustain or increase our profitability. See "Management's
Discussion and Analysis of Financial Condition and Results of Operations."

OUR QUARTERLY OPERATING RESULTS HAVE VARIED SIGNIFICANTLY AND, IF SEVERAL
FACTORS AFFECTING OUR BUSINESS CAUSE THEM TO CONTINUE TO DO SO, THE MARKET PRICE
OF OUR COMMON STOCK COULD BE AFFECTED

    Our operating results have varied significantly from quarter to quarter and
may continue to do so in the future depending upon a number of factors affecting
us or our industry described below and elsewhere in this prospectus, including
many that are beyond our control. As a result, we believe that period-to-period
comparisons of our operating results are not necessarily meaningful, and you
should not rely on them as an indication of our future performance. In addition,
our operating results in a future quarter or quarters may fall below
expectations of securities analysts or investors and, as a result, the price of
our common stock may fluctuate.

                                       7
<PAGE>
    Because we do not know when our potential end-user customers will place
orders and finalize contracts, we cannot accurately forecast our revenues and
operating results for future quarters. We recognize revenues upon satisfaction
of the requirements of AICPA Statement of Position 97-2, which generally occurs
in the same quarter that the order is received. As a result, our quarterly
revenues and operating results depend primarily on the size, quantity and timing
of orders received for our products during each quarter. If a large number of
orders or several large orders do not occur or are deferred or delayed, our
revenues in a quarter could be substantially reduced. This risk is heightened by
the significant investment and executive level decision making typically
involved in our end-user customers' decisions to license our products. Since a
large portion of our operating expenses, including rent and salaries, is fixed
and difficult to reduce or modify, our business, financial condition or results
of operations could be materially adversely affected if revenues do not meet our
expectations.

    Because of our early stage of development and limited number of products,
changes in pricing policies and the timing of the development, announcement and
sale of new or upgraded versions of our products are some of the additional
factors that could cause our revenues and operating results to vary
significantly from quarter to quarter. We recently released EIC Version 1.3 and
Interaction Dialer, as described in "Business--Products."

WE HAVE A LENGTHY PRODUCT SALES CYCLE, WHICH HAS CONTRIBUTED, AND MAY CONTINUE
TO CONTRIBUTE, TO THE QUARTER-TO-QUARTER VARIABILITY OF OUR REVENUES AND
OPERATING RESULTS, WHICH COULD AFFECT THE MARKET PRICE OF OUR COMMON STOCK

    We have generally experienced a lengthy product sales cycle, averaging
approximately six to nine months. The lengthy sales cycle is one of the factors
that has caused, and may in the future continue to cause, our software revenues
and operating results to vary significantly from quarter to quarter, which could
affect the market price of our common stock. It also makes it difficult for us
to forecast product license revenues. Because of the unique characteristics of
our products, our prospective end-user customers' decisions to license our
products often require significant investment and executive level decision
making. We believe that many companies currently are not aware of the benefits
of enterprise software of the type we license or of our products and
capabilities. For this reason, we must provide a significant level of education
to prospective end-user customers about the use and benefits of our products,
which can cause potential end-user customers to take many months to make these
decisions. As a result, sales cycles for end-user customer orders vary
substantially from customer to customer. Excessive delay in product sales could
materially adversely affect our business, financial condition or results of
operations.

    The length of the sales cycle for end-user customer orders depends on a
number of other factors over which we have little or no control, including:

    - an end-user customer's budgetary constraints;

    - the timing of an end-user customer's budget cycles;

    - concerns by end-user customers about the introduction of new products by
      us or our competitors; and

    - potential downturns in general economic conditions, including reductions
      in demand for call center services.

To the extent that potential end-user customers divert resources and attention
to issues associated with the Year 2000 problem, our sales cycle could lengthen
further. See "--Year 2000 issues may adversely affect our business." In
addition, the sales cycle for our products in international markets has been,
and is expected to continue to be, longer than the sales cycle in the United
States. The average sales cycle for our products may lengthen as we expand
internationally.

                                       8
<PAGE>
OUR INABILITY TO MANAGE SUCCESSFULLY OUR GROWTH OR OUR INCREASINGLY COMPLEX
THIRD PARTY RELATIONSHIPS COULD ADVERSELY AFFECT US

    If we are not able to manage our growth successfully, we will not grow as
planned and our business could be adversely affected. We have grown revenues
from $1.6 million in 1997 to $9.0 million in 1998, and we intend to continue to
grow our business operations significantly in the future. Our existing
management, operational, financial and human resources and management
information systems and controls may be inadequate to support our future
operations. In addition, as the complexity of our product technology and our
reseller and other third-party relationships have increased, the management of
those relationships and the negotiation of contractual terms sufficient to
protect our rights and limit our potential liabilities has become more
complicated, and we expect this trend to continue in the future. As a result,
our inability to successfully manage these relationships or negotiate sufficient
contractual terms could have a material adverse effect on us.

WE FACE COMPETITIVE PRESSURES, WHICH MAY HAVE A MATERIAL ADVERSE EFFECT ON US

    The market for our software products is highly competitive and, because
there are relatively low barriers to entry in the software market, we expect
competition to increase significantly in the future. In addition, because our
industry is new and evolving and characterized by rapid technological change, it
is difficult for us to predict whether, when and by whom new competing
technologies or new competitors may be introduced into our markets. Currently,
our competition comes from several different market segments, including computer
telephony platform developers, computer telephony applications software
developers and telecommunications equipment vendors. We cannot assure you that
we will be able to compete effectively against current and future competitors.
In addition, increased competition or other competitive pressures may result in
price reductions, reduced margins or loss of market share, any of which could
have a material adverse effect on our business, financial condition or results
of operations. See "Business--Competition."

    Many of our current and potential competitors have longer operating
histories, significantly greater financial, technical, marketing, customer
service and other resources, greater name recognition and a larger installed
base of customers than we do. As a result, these competitors may be able to
respond to new or emerging technologies and changes in customer requirements
faster and more effectively than we can, or to devote greater resources to the
development, promotion and sale of products than we can. Current and potential
competitors have established, and may in the future establish, cooperative
relationships among themselves or with third parties, including mergers or
acquisitions, to increase the ability of their products to address the needs of
our current or prospective end-user customers. If these competitors were to
acquire significant market share, it could have a material adverse effect on our
business, financial condition or results of operations.

WE MAY NOT BE ABLE TO GROW OUR BUSINESS AS PLANNED IF WE DO NOT MAINTAIN
SUCCESSFUL RELATIONSHIPS WITH OUR RESELLERS AND CONTINUE TO RECRUIT AND TRAIN
ADDITIONAL RESELLERS

    Our ability to achieve revenue growth in the future will depend in part on
our success in maintaining successful relationships with our existing and future
resellers and in recruiting and training additional resellers. We rely primarily
on resellers to market and support our products. We are still developing and
refining our reseller distribution network and may be unable to attract
additional resellers with both voice and data expertise that will be able to
market our products effectively and that will be qualified to provide timely and
cost-effective customer support and service. We generally do not have long-term
or exclusive agreements with our resellers, and the loss of specific larger
resellers or a significant number of resellers could materially adversely affect
our business, financial condition or results of operations.

                                       9
<PAGE>
OUR MARKETS ARE CHARACTERIZED BY RAPID TECHNOLOGICAL CHANGE WHICH MAY CAUSE US
TO INCUR SIGNIFICANT DEVELOPMENT COSTS AND PREVENT US FROM ATTRACTING NEW
CUSTOMERS

    The market for our products is characterized by rapid technological change,
frequent new product introductions and enhancements, uncertain product life
cycles and changing end-user customer demands. The introduction of products
embodying new technologies and the emergence of new industry standards could
render existing products obsolete or unmarketable and cause us to incur
significant development costs.

A DECLINE IN MARKET ACCEPTANCE FOR MICROSOFT CORPORATION TECHNOLOGIES ON WHICH
OUR PRODUCTS RELY COULD HAVE A MATERIAL ADVERSE EFFECT ON US

    EIC currently runs only on Microsoft Windows NT-Registered Trademark-
servers. In addition, our products use other Microsoft Corporation technologies,
including Microsoft Exchange Server-Registered Trademark- and Microsoft SQL
Server-Registered Trademark-. A decline in market acceptance for Microsoft
technologies or the increased acceptance of other server technologies could
cause us to incur significant development costs and could have a material
adverse effect on our ability to market our current products. Although we
believe that Microsoft technologies will continue to be widely used by
businesses, we cannot assure you that businesses will adopt these technologies
as anticipated or will not in the future migrate to other computing technologies
that we do not currently support. In addition, our products and technologies
must continue to be compatible with new developments in Microsoft technologies.

OUR FUTURE BUSINESS PROSPECTS DEPEND IN PART ON OUR ABILITY TO MAINTAIN AND
IMPROVE OUR CURRENT PRODUCTS AND DEVELOP NEW PRODUCTS

    We believe that our future business prospects depend in large part on our
ability to maintain and improve our current products and to develop new products
on a timely basis. Our products will have to achieve market acceptance, maintain
technological competitiveness and meet an expanding range of end-user customer
requirements. As a result of the complexities inherent in our products, major
new products and product enhancements require long development and testing
periods. We may not be successful in developing and marketing, on a timely and
cost effective basis, product enhancements or new products that respond to
technological change, evolving industry standards or end-user customer
requirements. We may also experience difficulties that could delay or prevent
the successful development, introduction or marketing of product enhancements,
and our new products and product enhancements may not achieve market acceptance.
Significant delays in the general availability of new releases of our products
or significant problems in the installation or implementation of new releases of
our products could have a material adverse effect on our business, financial
condition or results of operations. We recently released EIC Version 1.3 and
Interaction Dialer, as described in "Business-- Products."

SLOWER THAN ANTICIPATED GROWTH IN DEMAND FOR ENTERPRISE SOFTWARE OF THE TYPE WE
LICENSE COULD MATERIALLY ADVERSELY AFFECT OUR GROWTH PROSPECTS

    If the demand for enterprise software of the type we license does not
continue to grow as anticipated within each of our three targeted markets, our
ability to grow our business as planned could be materially adversely affected.
All of our revenues have been generated from licenses of our EIC software or
complementary products, and related support, educational and professional
services. We expect these products and services to account for the majority of
our revenues for the foreseeable future. Although we believe demand for the
functions performed by EIC is high, and growth in demand has accelerated in
recent years, particularly among call centers, the market for our products and
services is still emerging. Further, our growth plans require us to successfully
attract end-user customers in our two other target markets, enterprises and
service providers, which have been much slower to adopt software technologies
such as our EIC product.

                                       10
<PAGE>
IF WE ARE UNABLE TO ADAPT OUR SOFTWARE IN A WAY THAT WILL PERMIT US TO SERVE
LARGE, SINGLE-SITE END-USER CUSTOMERS, THE MARKETABILITY OF EIC COULD BE
ADVERSELY AFFECTED

    EIC currently serves small to medium sized call centers and enterprises with
approximately 25 to 300 users at a single location. As these organizations
expand to include multiple locations, EIC can be customized to increase the
number of telephone lines, extensions and users. However, EIC cannot currently
meet the communications needs of organizations with more than 200 users at a
single call center location or 300 users at a single enterprise location. We
will need to adapt our software to serve larger single-site organizations. We
may not be able to adapt our software in a timely or cost effective manner in a
way that will permit us to serve these customers. This inability could have a
material adverse effect on our business, financial condition or results of
operations.

DIALOGIC CORPORATION MAY BECOME UNWILLING OR UNABLE TO CONTINUE TO MANUFACTURE
AND SUPPLY US WITH VOICE PROCESSING BOARDS, REQUIRING US TO INTRODUCE A
SUBSTITUTE SUPPLIER WHICH COULD PROVE DIFFICULT OR COSTLY

    Dialogic Corporation is currently our only supplier of the voice processing
boards that are necessary for the operation of EIC. If Dialogic Corporation
becomes unable or unwilling to continue to manufacture and supply these voice
processing boards in the volume, price and technical specifications we require,
then we would have to adapt our products to a substitute supplier. Introducing a
new supplier of voice processing boards could result in unforeseen additional
product development or customization costs and could also introduce hardware and
software operating or compatibility problems. These problems could affect
product shipments, be costly to correct or damage our reputation in the markets
in which we operate, and could have a material adverse affect on our business,
financial condition or results of operations.

    In addition, Intel Corporation recently acquired Dialogic Corporation. While
Intel Corporation does not currently offer a product that competes with our EIC,
Intel Corporation could potentially develop a competitive or superior product or
attempt to affect our current relationship with Dialogic Corporation.

    In addition, Dialogic Corporation's CT Media offers some of the
functionality that EIC provides and consequently could make it easier for
competitors or potential competitors to provide products competitive with ours.
If CT Media were to become an industry standard, our failure to adopt it could
disadvantage us in competitive situations. See "Certain
Transactions--Relationship with Dialogic."

WE MAY NOT BE ABLE TO PROTECT OUR PROPRIETARY RIGHTS ADEQUATELY, WHICH COULD
ALLOW THIRD PARTIES TO COPY OR OTHERWISE OBTAIN AND USE OUR TECHNOLOGY WITHOUT
AUTHORIZATION

    We regard our software products as proprietary. In an effort to protect our
proprietary rights, we rely primarily on a combination of copyright, trademark
and trade secret laws, as well as licensing and other agreements with
consultants, suppliers, strategic partners, resellers and end-user customers,
and employee and third-party non-disclosure agreements. These laws and
agreements provide only limited protection of our proprietary rights. In
addition, we have not signed agreements containing these types of protective
provisions in every case, and the contractual provisions that are in place and
the protection they provide vary and may not provide us with adequate protection
in all circumstances. Although we have recently filed provisional patent
applications directed to several inventions embodied in our software products,
we currently have no patents or registered copyrights. Because our means of
protecting our proprietary rights may not be adequate, it may be possible for a
third party to copy or otherwise obtain and use our technology without
authorization. A third party could also develop similar technology
independently. In addition, the laws of some countries in which we sell our
products do not protect our software and intellectual property rights to the
same extent as the laws of the United

                                       11
<PAGE>
States. Unauthorized copying, use or reverse engineering of our products could
materially adversely affect our business, results of operations or financial
condition.

    We license technology that is embedded in our products from others. If one
or more of these licenses terminates or cannot be renewed on satisfactory terms,
we would have to modify the affected products to use alternative technology or
eliminate the affected product function, either of which could have a material
adverse effect on us.

INFRINGEMENT CLAIMS COULD ADVERSELY AFFECT US

    A third party could claim that our technology infringes its proprietary
rights. As the number of software products in our target markets increases and
the functionality of these products overlap, we believe that software developers
may face infringement claims. For example, various patent rights have been
asserted against interfaces between PBX hardware and computer network systems.
Although we believe that our products do not infringe any of these patents
because, among other reasons, our products are designed to replace PBXs and not
to create such interfaces, if these patents were interpreted broadly, claims of
infringement of these patents could have a material adverse affect on us.

    In June 1999, we received a letter from a large, well capitalized competitor
in the call center market claiming that our products utilize technologies
pioneered and patented by that competitor and suggesting that we discuss the
terms of a potential license of their technologies. These patented technologies
relate to a variety of call management systems or functions. A limited number of
features among the many that are available as a part of our EIC and Interaction
Dialer products have been questioned by the competitor. Our patent counsel,
Woodard, Emhardt, Naughton, Moriarty & McNett, has reviewed all of the 15
patents listed in the letter from the competitor and provided us its opinion
that our products do not infringe any of the 15 patents listed. The competitor
has been advised of our patent counsel's opinion, and there are ongoing
discussions to determine whether the competitor will concur with that opinion.
To date, substantially all of our software license revenues have been from EIC
and Interaction Dialer. However, the discussions relate only to certain features
of these products and we are unable to quantify the revenues related to those
features or to determine the effect, if any, that those features might have on
an end-user customer's decision whether to license our products for some uses.
Although we believe this matter can be resolved amicably, if we are unable to do
so, infringement claims could be made or litigation commenced by the competitor,
or a license agreement could be required, any of which could have a material
adverse effect on our business, financial condition or results of operations.

    Infringement claims, even if without merit, can be time consuming and
expensive to defend. A third party asserting infringement claims against us or
our customers with respect to our current or future products may require us to
enter into costly royalty arrangements or litigation, or otherwise materially
adversely affect us. See "Business--Intellectual Property and Other Proprietary
Rights."

WE DEPEND ON KEY PERSONNEL AND WILL NEED TO RECRUIT ADDITIONAL SKILLED
PERSONNEL, FOR WHICH COMPETITION IS INTENSE, TO CONDUCT AND GROW OUR BUSINESS
EFFECTIVELY

    Our success depends in large part on the continued service of our key
personnel, particularly Dr. Donald E. Brown, our co-founder, Chief Executive
Officer and principal stockholder, and Dr. Michael D. Gagle, our Chief
Scientist. The loss of the services of either of these individuals or any key
personnel could have a material adverse effect on our business, financial
condition or results of operations. We have a key man life insurance policy on
Dr. Brown in the amount of $3.0 million. Our future success also depends upon
our ability to attract, train, assimilate and retain additional qualified
personnel. Competition for persons with skills in the software industry is
intense, particularly for those with relevant technical experience. We cannot
assure you that we will be able to retain our key

                                       12
<PAGE>
employees or that we can attract, train, assimilate or retain other highly
qualified personnel in the future. See "Management" for a description of some of
our key personnel.

WE MAY PURSUE ACQUISITIONS THAT BY THEIR NATURE PRESENT RISKS AND THAT MAY NOT
BE SUCCESSFUL

    In the future we may pursue acquisitions to diversify our product offerings
and customer base or for other strategic purposes. We have no prior history of
making acquisitions and we cannot assure you that any future acquisitions will
be successful. The following are some of the risks associated with acquisitions
that could have a material adverse effect on our business, financial condition
or results of operations:

    - We cannot ensure that any acquired businesses will achieve anticipated
      revenues, earnings or cash flow.

    - We may be unable to integrate acquired businesses successfully and realize
      anticipated economic, operational and other benefits in a timely manner,
      particularly if we acquire a business in a market in which we have limited
      or no current expertise, or with a corporate culture different from our
      own. If we are unable to integrate acquired businesses successfully, we
      could incur substantial costs and delays or other operational, technical
      or financial problems.

    - Acquisitions could disrupt our ongoing business, distract management,
      divert resources and make it difficult to maintain our current business
      standards, controls and procedures.

    - We may finance future acquisitions by issuing common stock for some or all
      of the purchase price. This could dilute the ownership interests of our
      stockholders. We may also incur additional debt or be required to
      recognize amortization expense related to goodwill and other intangible
      assets purchased in future acquisitions.

    - We would be competing with other firms, many of which have greater
      financial and other resources, to acquire attractive companies. We believe
      this competition will increase, making it more difficult to acquire
      suitable companies on acceptable terms.

OUR INTERNATIONAL OPERATIONS AND EXPANSION INVOLVE FINANCIAL AND OPERATIONAL
RISKS

    The expansion of our international operations will require significant
management attention and financial resources to establish additional foreign
operations, hire additional personnel and recruit additional international
resellers. Non-North American revenues accounted for 17% of our total revenues
in 1997, 16% of our total revenues in 1998 and 20% of our total revenues in the
first half of 1999. To date, our products have been licensed outside North
America primarily in Western Europe, South Africa and Australia. We are
currently expanding our marketing efforts in Japan, Korea, China and Central and
South America. We intend to continue to expand our international operations and
enter additional international markets. Revenues from international expansion
may be inadequate to cover the expenses of international expansion. In addition
to the foreign currency risks described below, other risks inherent in our
international business activities, in the countries in which we have licensed
our products to date and in those countries in which we intend to expand,
generally could include the following:

    - economic and political instability;

    - unexpected changes in foreign regulatory requirements and laws;

    - tariffs and other trade barriers;

    - timing, cost and potential difficulty of adapting our software products to
      the local language in those foreign countries that do not use the alphabet
      that English uses, such as Japan, Korea and China;

                                       13
<PAGE>
    - lack of acceptance of our products in foreign countries;

    - longer sales cycles and accounts receivable payment cycles;

    - potentially adverse tax consequences; and

    - restrictions on the repatriation of funds.

FLUCTUATIONS IN THE VALUE OF FOREIGN CURRENCIES COULD RESULT IN LOSSES

    Our international revenues are generally denominated in U.S. Dollars, but
our international expenses are generally denominated in local foreign
currencies. Although foreign currency translation gains and losses have been
immaterial to date, fluctuations in exchange rates between the U.S. Dollar and
other currencies could have a material adverse effect on our business, financial
condition or results of operations, and particularly on our operating margins.
To date, we have not sought to hedge the risks associated with fluctuations in
exchange rates, but we may undertake to do so in the future. Any hedging
techniques we implement in the future may not be successful. Exchange rate
fluctuations could also make our products more expensive than competitive
products not subject to these fluctuations, which could adversely affect our
revenues and profitability in international markets.

OUR PRODUCTS COULD HAVE DEFECTS FOR WHICH WE ARE POTENTIALLY LIABLE AND WHICH
COULD RESULT IN LOSS OF REVENUE, INCREASED COSTS OR LOSS OF OUR CREDIBILITY OR
DELAY IN ACCEPTANCE OF OUR PRODUCTS IN THE MARKET

    Our products, including components supplied by others, may contain errors or
defects, especially when first introduced or when new versions are released.
Despite internal product testing, we have in the past discovered software errors
in some of our products after their introduction. Errors in new products or
releases could be found after commencement of commercial shipments, and this
could result in additional development costs, diversion of technical and other
resources from our other development efforts, or the loss of credibility with
current or future end-user customers. This could result in a loss of revenue or
delay in market acceptance of our products, which could have a material adverse
effect upon our business, financial condition or results of operations. We
recently released EIC Version 1.3 and Interaction Dialer, as described in
"Business--Products."

    Our license agreements with our end-user customers typically contain
provisions designed to limit our exposure to potential product liability and
some contract claims. However, not all of these agreements contain these types
of provisions and, where present, these provisions vary as to their terms and
may not be effective under the laws of some jurisdictions. A product liability,
warranty, or other claim brought against us could have a material adverse effect
on our business, financial condition or results of operations.

    Because our solution consists of our software running on a Windows
NT-Registered Trademark- server and Dialogic Corporation voice processing
boards, it is inherently more prone to performance interruptions for our
end-user customers than traditional non-software based products. Performance
interruptions at our end-user customer sites, most of which currently do not
have back-up systems, could affect demand for our products or give rise to
claims against us.

YEAR 2000 ISSUES MAY ADVERSELY AFFECT OUR BUSINESS

    In the course of our business, we test and evaluate our software products
for Year 2000 compliance. Based on this testing and evaluation, we believe that
the current versions of our products are capable of adequately distinguishing
21st century dates from 20th century dates. We have warranted that all of our
current products are Year 2000 compliant. If any of our end-user customers
experience Year 2000 problems as a result of their use of our products, those
end-user customers could assert claims against us for damages which, if
successful, could materially adversely affect our business, financial condition
or results of operations. In addition, many of our products have third-party

                                       14
<PAGE>
technologies embedded in them, and our products at times are integrated into
enterprise systems involving sophisticated hardware and complex software
products. We cannot adequately evaluate these technologies or products for Year
2000 compliance. Our two material suppliers have not warranted that their
products which could impact the performance of our products are Year 2000
compliant. Our most reasonably likely worst case scenario is that we could lose
current or potential customers, incur costs related to replacing third party
products or face claims under our warranties, or otherwise, based on Year 2000
problems in other companies' products, or issues arising from the integration of
multiple products within an overall system, any of which could have a material
adverse effect on our business, financial condition or results of operations.
Since we are in the business of selling software, our risk of facing claims
relating to Year 2000 issues is greater than that of companies in some other
industries.

    We are in the process of testing our internal management information and
other critical business systems to identify any Year 2000 problems. We have also
begun to contact key suppliers and intend to contact our key resellers about
their Year 2000 readiness. To date, we are not aware of any material suppliers
or resellers with Year 2000 issues that would materially affect us. However, we
cannot guarantee that the systems of other companies on which our operations
rely will be timely converted or that failure to timely convert would not have a
material adverse effect on us.

    We believe that the purchasing patterns of end-user customers and potential
end-user customers may be affected by Year 2000 issues as companies expend
significant resources to correct or upgrade their current software systems for
Year 2000 compliance. These expenditures may reduce the funds available to
license software products such as those we offer. To the extent Year 2000 issues
significantly disrupt decisions to license our products or purchase our
services, our business, financial condition or results of operations could be
materially adversely affected.

    For a more detailed description of our Year 2000 assessment, see
"Management's Discussion and Analysis of Financial Condition and Results of
Operations--Year 2000 Compliance."

WE MAY NOT BE ABLE TO OBTAIN ADEQUATE FINANCING TO IMPLEMENT OUR GROWTH STRATEGY

    Successful implementation of our growth strategy will likely require
continued access to capital. If we do not generate sufficient cash from
operations, our growth could be limited unless we are able to obtain capital
through additional debt or equity financings. We cannot assure you that debt or
equity financings will be available as required for acquisitions or other needs.
Even if financing is available, it may not be on terms that are favorable to us
or sufficient for our needs. If we are unable to obtain sufficient financing, we
may be unable to fully implement our growth strategy.

NO PRIOR PUBLIC MARKET HAS EXISTED FOR OUR SHARES AND AN ACTIVE TRADING MARKET
MAY NOT DEVELOP OR BE SUSTAINED

    Before this offering, there has been no public market for our common stock.
We cannot assure you that an active trading market will develop or be sustained
after this offering. You may not be able to resell your shares at or above the
initial public offering price. The initial public offering price has been
determined through negotiations between the underwriters and us. See
"Underwriting."

OUR STOCK PRICE COULD BE HIGHLY VOLATILE

    Our stock price could be highly volatile due to a number of factors,
including:

    - actual or anticipated fluctuations in our operating results;

    - announcements by us, our competitors or our end-user customers;

    - changes in financial estimates of securities analysts or investors
      regarding us, our industry, our competitors or our end-user customers;

                                       15
<PAGE>
    - technological innovations by others;

    - the operating and stock price performance of other comparable companies or
      of our competitors or end-user customers; and

    - general market or economic conditions.

This risk may be heightened because our industry is new and evolving,
characterized by rapid technological change and susceptible to the introduction
of new competing technologies or competitors.

    In addition, the stock market has experienced significant price and volume
fluctuations that have particularly affected the trading prices of equity
securities of many technology companies. These price and volume fluctuations
often have been unrelated to the operating performance of the affected
companies. In the past, following periods of volatility in the market price of a
company's securities, securities class action litigation has often been
instituted against that company. This type of litigation, regardless of the
outcome, could result in substantial costs and a diversion of management's
attention and resources, which could materially and adversely affect our
business, financial condition or results of operations.

AVAILABILITY OF SIGNIFICANT AMOUNTS OF COMMON STOCK FOR SALE IN THE FUTURE COULD
ADVERSELY AFFECT OUR STOCK PRICE

    The availability for future sale, or sales, of a substantial number of
shares of our common stock in the public market or otherwise following this
offering could adversely affect the market price for our common stock. See
"Shares Eligible for Future Sale" for information regarding the number of shares
of common stock eligible for public sale after this offering.

OUR EXECUTIVE OFFICERS AND DIRECTORS CONTROL US AND MAY MAKE DECISIONS THAT YOU
DO NOT CONSIDER TO BE IN YOUR BEST INTEREST

    Immediately after this offering, our executive officers and directors will,
in the aggregate, hold approximately 72.2% of our outstanding common stock.
Accordingly, these stockholders will be able to control us through their ability
to determine the outcome of the election of our directors, amend our Restated
Articles of Incorporation and By-Laws and take other actions requiring the vote
or consent of stockholders, including mergers, going private transactions and
other extraordinary transactions, and the terms of any of these transactions.
The ownership position of these stockholders may have the effect of delaying,
deterring or preventing a change in control or a change in the composition of
our board of directors. See "Principal and Selling Stockholders" for information
concerning the beneficial ownership of our common stock.

ANTITAKEOVER PROVISIONS IN OUR ORGANIZATIONAL DOCUMENTS AND INDIANA LAW MAKE ANY
CHANGE IN CONTROL OF US MORE DIFFICULT, MAY DISCOURAGE BIDS AT A PREMIUM OVER
THE MARKET PRICE AND MAY ADVERSELY AFFECT THE MARKET PRICE OF OUR STOCK

    Our Restated Articles of Incorporation and By-Laws contain provisions that
may have the effect of delaying, deferring or preventing a change in control of
us, may discourage bids at a premium over the market price of our common stock
and may adversely affect the market price of our common stock, and the voting
and other rights of the holders of our common stock. These provisions include:

    - the division of our board of directors into three classes serving
      staggered three-year terms;

    - removal of directors only for cause and only upon a 66 2/3% stockholder
      vote;

    - prohibiting stockholders from calling a special meeting of stockholders;

                                       16
<PAGE>
    - the ability to issue additional shares of our common stock or preferred
      stock without stockholder approval; and

    - advance notice requirements for raising business or making nominations at
      stockholders' meetings.

    The Indiana corporation law contains business combination provisions that,
in general, prohibit for five years any business combination with a beneficial
owner of 10% or more of our common stock unless the holder's acquisition of the
stock was approved in advance by our board of directors. The Indiana corporation
law also contains control share acquisition provisions that limit the ability of
certain stockholders to vote their shares unless their control share acquisition
was approved in advance. See "Description of Capital Stock" for a description of
these provisions.

WE MAY BE UNABLE TO MANAGE SIGNIFICANT UNALLOCATED NET PROCEEDS FROM THIS
OFFERING EFFECTIVELY WHICH COULD ADVERSELY AFFECT THE MARKET PRICE OF OUR COMMON
STOCK

    We will have a significant amount of net proceeds from this offering that we
have not allocated to a specific use. The failure of management to apply these
proceeds effectively could materially and adversely affect our business,
financial condition or results of operations and, therefore, the market price of
our common stock. We will use a portion of the net proceeds of this offering to
repay all indebtedness, including accrued interest, owed to our principal
stockholder, and to pay deferred compensation and other non-interest bearing
accounts payable to him, which amounts totaled approximately $7.9 million as of
June 30, 1999. We have not designated any specific uses for the remaining net
proceeds of this offering. Therefore, we will have broad discretion in how we
use the net proceeds of this offering, which may include general corporate
purposes, such as working capital and potential acquisitions. See "Use of
Proceeds."

INVESTORS WILL INCUR IMMEDIATE DILUTION AND MAY EXPERIENCE FURTHER DILUTION

    The initial public offering price is substantially higher than the net
tangible book value per share of the outstanding common stock immediately after
this offering, which was a deficit of $0.75 per share as of June 30, 1999. If
you purchase our common stock in this offering, you will incur immediate and
substantial dilution in the net tangible book value per share of common stock
from the price you pay per share of common stock. We also have outstanding a
large number of stock options to purchase common stock with exercise prices
significantly below the initial public offering price of the common stock. To
the extent these options are exercised, there will be further dilution. We
intend to continue to grant stock options to our employees as part of our
general compensation practices. See "Dilution."

                                       17
<PAGE>
                                USE OF PROCEEDS
    We expect to receive approximately $31.5 million from the sale of the
2,670,000 shares of common stock offered by us at the initial public offering
price of $13.00 per share, after deducting the underwriting discounts of $2.4
million and estimated expenses of $750,000 to be paid by us. We expect to
receive an additional $4.0 million of net proceeds if the underwriters exercise
their overallotment options in full. We will not receive any proceeds from the
sale of common stock by the selling stockholder.

    We intend to use the net proceeds of this offering:

    - for general corporate purposes, including working capital and potential
      acquisitions;

    - to repay indebtedness under our lines of credit which aggregated
      approximately $1.9 million at August 31, 1999;

    - to repay indebtedness of approximately $7.5 million, including accrued
      interest, that we owe to our principal stockholder, Dr. Donald E. Brown,
      which was advanced for working capital purposes, has an interest rate of
      10% and matures on December 31, 2001; and

    - to pay approximately $0.6 million in deferred compensation to Dr. Brown
      for services rendered as our Chief Executive Officer and other
      non-interest bearing accounts payable to him. Dr. Brown elected to defer
      his compensation and not seek reimbursment of these accounts payable to
      conserve our cash position before this offering.

Pending these uses, we expect to invest the net proceeds from this offering in
short-term investment grade, interest-bearing securities. While we engage in
discussions relating to potential acquisitions from time to time, we have
entered into no agreements with respect to these transactions.

                                DIVIDEND POLICY

    We have never paid cash dividends on our common stock. We do not anticipate
that we will pay any cash dividends on our common stock in the foreseeable
future and we plan to retain our earnings to finance operations and future
growth. The declaration and payment of dividends on our common stock will be at
the discretion of our board of directors and must comply with applicable law and
any restrictions in our credit facilities. Any decisions to pay dividends in the
future will depend on general business conditions, our financial condition and
other factors our board of directors may in the future consider to be relevant.

                                       18
<PAGE>
                                 CAPITALIZATION

    The following table sets forth our actual capitalization as of June 30,
1999, and our capitalization as adjusted to reflect our receipt and application
of the estimated net proceeds, at the initial public offering price of $13.00
per share, from the sale of the shares of common stock offered by us in this
prospectus. You should read this table with the financial statements and the
notes to the financial statements and "Management's Discussion and Analysis of
Financial Condition and Results of Operations" included elsewhere in this
prospectus.

<TABLE>
<CAPTION>
                                                                                                JUNE 30, 1999
                                                                                           -----------------------
                                                                                             ACTUAL    AS ADJUSTED
                                                                                           ----------  -----------
                                                                                                 (UNAUDITED)
                                                                                           (DOLLARS IN THOUSANDS)
<S>                                                                                        <C>         <C>
Short-term debt:
  Lines of credit........................................................................  $    1,055   $      --
                                                                                           ----------  -----------
                                                                                           ----------  -----------

Long-term debt:
  Accounts payable and deferred compensation--stockholder................................  $      550   $      --
  Notes payable and accrued interest--stockholder........................................       7,346          --
  Capital lease obligations..............................................................         627         627
                                                                                           ----------  -----------
                                                                                                8,523         627

Stockholders' equity (deficit):
  Preferred stock, without par value, 10,000,000 shares authorized, none outstanding,
    actual and as adjusted...............................................................          --          --
  Common stock, $.01 par value; 100,000,000 shares authorized, 10,700,121 shares issued
    and outstanding, actual; 13,370,121 shares issued and outstanding, as adjusted.......         107         134
  Additional paid in capital.............................................................      10,739      42,242
  Accumulated deficit....................................................................     (18,843)    (18,843)
                                                                                           ----------  -----------
    Total stockholders' equity (deficit).................................................      (7,997)     23,533
                                                                                           ----------  -----------
      Total capitalization...............................................................  $      526   $  24,160
                                                                                           ----------  -----------
                                                                                           ----------  -----------
</TABLE>

                                       19
<PAGE>
                                    DILUTION
    As of June 30, 1999, our net tangible book value (deficit) was $(8.0)
million or $(0.75) per share of common stock. "Net tangible book value
(deficit)" per share represents the amount of our total tangible assets reduced
by the amount of our total liabilities, divided by the number of shares of
common stock outstanding. As of June 30, 1999, our net tangible book value
(deficit), on a pro forma basis as adjusted for the sale of the shares offered
by us in this offering at the initial public offering price of $13.00 per share
and the application of the estimated net proceeds from that sale of
approximately $31.5 million, would have been $23.5 million, or approximately
$1.76 per share. This represents an immediate increase of $2.51 per share to
existing stockholders and an immediate dilution of $11.24 per share to new
investors. The following table illustrates this per share dilution:

<TABLE>
<S>                                                                  <C>          <C>
Initial public offering price per share............................                $   13.00
  Net tangible book value (deficit) per share as of June 30,
    1999...........................................................   $   (0.75)
  Increase per share attributable to new investors.................        2.51
                                                                     -----------
Pro forma net tangible book value (deficit) per share after this
  offering.........................................................                     1.76
                                                                                  -----------
Dilution per share to new investors................................                $   11.24
                                                                                  -----------
                                                                                  -----------
</TABLE>

    The following table summarizes as of June 30, 1999 the differences between
the total consideration paid and the average price per share paid by the
existing stockholders and the new investors with respect to the number of shares
of common stock purchased from us at the initial public offering price of $13.00
per share.

<TABLE>
<CAPTION>
                                            SHARES PURCHASED          TOTAL CONSIDERATION
                                        -------------------------  --------------------------  AVERAGE PRICE
                                           NUMBER       PERCENT       AMOUNT        PERCENT      PER SHARE
                                        ------------  -----------  -------------  -----------  -------------
<S>                                     <C>           <C>          <C>            <C>          <C>
Existing stockholders.................    10,700,121       80.0%   $  10,846,000       23.8%     $    1.01
New investors.........................     2,670,000       20.0       34,710,000       76.2      $   13.00
                                        ------------      -----    -------------      -----
  Total...............................    13,370,121      100.0%   $  45,556,000      100.0%     $    3.41
                                        ------------      -----    -------------      -----
                                        ------------      -----    -------------      -----
</TABLE>

    If the underwriters exercise their over-allotment options in full, the
resulting sale of shares by the selling stockholder in this offering would
reduce the number of shares held by existing stockholders to 10,630,121 shares,
or approximately 77.6% of the total number of shares of common stock to be
outstanding after this offering, and would increase the number of shares held by
new investors to 3,070,500 shares, or approximately 22.4% of the total number of
shares of common stock to be outstanding after this offering.

                                       20
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA

    In the table below, we provide selected consolidated financial data of
Interactive Intelligence. We prepared this information using our unaudited
consolidated financial statements for the period from October 1, 1994
(inception) through December 31, 1994 and the six-month periods ended June 30,
1998 and 1999 and from our audited consolidated financial statements for each of
the years in the four-year period ended December 31, 1998. You should read this
selected consolidated financial data together with our consolidated financial
statements and notes and "Management's Discussion and Analysis of Financial
Condition and Results of Operations" included in this prospectus. In our
opinion, our selected consolidated financial data for the period from October 1,
1994 (inception) through December 31, 1994 and the six-month periods ended June
30, 1998 and 1999 include all adjustments, consisting of only normal recurring
adjustments, necessary for a fair presentation of that data. The selected
consolidated financial data do not necessarily indicate the results to be
expected in the future.
<TABLE>
<CAPTION>
                                                                                                 SIX MONTHS
                                      OCTOBER 1, 1994         YEAR ENDED DECEMBER 31,          ENDED JUNE 30,
                                      (INCEPTION) TO     ---------------------------------  ---------------------
                                     DECEMBER 31, 1994    1995    1996     1997     1998     1998        1999
                                     -----------------   ------  -------  -------  -------  -------  ------------
                                                        (IN THOUSANDS, EXCEPT PER SHARE DATA)
<S>                                  <C>                 <C>     <C>      <C>      <C>      <C>      <C>
CONSOLIDATED STATEMENT OF
  OPERATIONS DATA:
Revenues:
  Software.........................       $   --         $   --  $    --  $ 1,265  $ 7,662  $ 2,980    $ 5,482
  Services.........................           --             --       --      325    1,349      407      1,826
                                          ------         ------  -------  -------  -------  -------  ------------
Total revenues.....................           --             --       --    1,590    9,011    3,387      7,308
Costs and expenses:
  Costs of software................           --             --       --       38       59       24         60
  Costs of services................           --             --       --    1,258    3,381    1,387      2,360
  Sales and marketing..............           --             19      157    2,519    6,623    2,715      4,553
  Research and development.........            8            297      987    2,118    4,065    1,837      3,004
  General and administrative.......           --             99      192      742    1,407      590      1,135
                                          ------         ------  -------  -------  -------  -------  ------------
Total costs and expenses...........            8            415    1,336    6,675   15,535    6,553     11,112
                                          ------         ------  -------  -------  -------  -------  ------------
Operating loss.....................           (8)          (415)  (1,336)  (5,085)  (6,524)  (3,166)    (3,804)
Interest expense, net..............           --              1       43      361      868      428        398
                                          ------         ------  -------  -------  -------  -------  ------------
Loss before income taxes...........           (8)          (416)  (1,379)  (5,446)  (7,392)  (3,594)    (4,202)
Income taxes.......................           --             --       --       --       --       --         --
                                          ------         ------  -------  -------  -------  -------  ------------
Net loss...........................       $   (8)        $ (416) $(1,379) $(5,446) $(7,392) $(3,594)   $(4,202)
                                          ------         ------  -------  -------  -------  -------  ------------
                                          ------         ------  -------  -------  -------  -------  ------------
Basic and diluted net loss per
  share............................       $(0.01)        $(0.21) $ (0.33) $ (0.71) $ (0.84) $ (0.44)   $ (0.40)
Shares used in per share
  computation......................        1,500          1,966    4,216    7,642    8,816    8,203     10,538

<CAPTION>

                                                                      AT DECEMBER 31,
                                                         ------------------------------------------  AT JUNE 30,
                                                          1994    1995     1996     1997     1998        1999
                                                         ------  -------  -------  -------  -------  ------------
                                                                              (IN THOUSANDS)
<S>                                  <C>                 <C>     <C>      <C>      <C>      <C>      <C>
CONSOLIDATED BALANCE SHEET DATA:
  Cash and cash equivalents........                      $   11  $    51  $    23  $   390  $ 2,021    $    87
  Working capital (deficit)........                          (4)      26     (544)  (1,575)   1,731     (3,167)
  Total assets.....................                          32      133      438    3,141    8,239      7,798
  Long-term debt...................                          --       --      593    5,872    9,490      8,523
  Total shareholders' equity
    (deficit)......................                          18      107     (803)  (6,217)  (5,154)    (7,997)
</TABLE>

                                       21
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

    This section includes a number of forward-looking statements that reflect
our current views with respect to future events and financial performance. See
"Forward-Looking Statements."

OVERVIEW

    We commenced operations in October 1994. Through the end of 1996, we focused
primarily on research and development activities. EIC was released in March
1997. In 1997 and 1998, we expanded our operations to capitalize on the
increased market demand for communications and interaction management software.
We decided, at the expense of profitability, to continue investing significantly
in research and development, and to accelerate our investments in marketing,
services and sales operations. We had no revenue in 1996, and our revenues
totaled $1.6 million in 1997 and $9.0 million in 1998. Since early 1997, we
have:

    - hired more than 140 employees;

    - established relationships with over 100 North American and international
      resellers;

    - located field sales personnel in 17 North American locations to support
      and manage our reseller network and entered the European and Asia/Pacific
      markets by locating personnel in France, the Netherlands, the United
      Kingdom, Japan and Korea;

    - released local language versions of EIC (Version 1.2) in French, German,
      Italian, Japanese, Korean and Norwegian;

    - released three upgrades to EIC, including EIC Version 1.3 released in July
      1999;

    - released two additional complementary software products, Interaction
      Recorder and Interaction Dialer;

    - developed and currently are testing one additional complementary software
      product, Interaction Director;

    - developed and are currently testing e-FAQ, an automated e-mail response
      product;

    - entered into our first contract with a service provider to license our
      unified messaging features, which contract provides for periodic payments
      upon the satisfaction of specified performance criteria and is subject to
      a right of termination by the licensee; and

    - entered into our first OEM contract with a software provider to license
      various features of EIC for use in its products, which contract provides
      for quarterly royalty and maintenance fee payments based on end-user
      volumes.

    We believe our investments in research and development and in marketing,
services and sales operations will continue to be critical to our revenue
growth. However, these investments have also significantly increased our
operating expenses, contributing to the net and operating losses that we have
incurred in each fiscal quarter since our formation. We anticipate that our
operating expenses will increase substantially for the foreseeable future as we
continue to expand our research and development, marketing, services and sales
operations. Accordingly, we are likely to continue to experience losses and
negative cash flows from operations in future quarters. We cannot assure you
when or if we will achieve profitability or, if achieved, that we will be able
to sustain profitability. Our operating results have varied significantly from
quarter to quarter and may continue to do so in the future. As a result, we
believe that period-to-period comparisons of our operating results are not
necessarily meaningful, and you should not rely on them as an indication of our
future performance. See "Risk Factors."

                                       22
<PAGE>
SOURCES OF REVENUE AND REVENUE RECOGNITION POLICY

    We generate a majority of our revenues from software license fees. Most of
our software license fees originate from the marketing efforts of our resellers,
who are authorized to place software orders with us on behalf of end-user
customers. We share end-user customer software license fees with these resellers
in varying percentages of our list price, according to the terms of their
reseller agreements. In addition to generating software license fees indirectly
through resellers, we also receive some software license fees from end-user
customers that we deal with directly.

    In accordance with AICPA Statement of Position (SOP) 97-2 as amended by SOP
98-4 and SOP 98-9, software license revenues can be recognized upon the shipment
of software if:

    - persuasive evidence of an arrangement exists;

    - sufficient vendor-specific objective evidence exists to support allocating
      the total fee to all elements of the arrangement;

    - the fee is fixed or determinable; and

    - collection is probable.

As a result, we typically recognize software license fees only when a reseller
places a binding order for our software, which gives the reseller the right to
distribute our products to end-user customers.

    We also generate revenues from services that we provide to our resellers and
end-user customers. Services revenues include product maintenance revenues,
which consist of technical support and product upgrades, educational services
and professional services. Our initial software license generally includes one
year of maintenance. Generally, to continue using our software after this
initial period, our end-user customers must purchase annual ongoing product
maintenance, which is priced at approximately 18% of the current list price of
the licensed product. We share maintenance revenues with those resellers who
provide first-level technical support according to the terms of their reseller
agreements. When these revenues are shared with resellers, we typically receive
between 50% and 70% of the amount charged to the end-user customer. We recognize
product maintenance revenues on a straight-line basis over the term of the
initial software license and each subsequent annual product maintenance
purchase. Revenues from educational services, which consist of training courses
for resellers and end-user customers, and professional services, which include
implementing and customizing our products for an end-user customer, are
typically recognized as the related services are performed.

    In 1997, no end-user customer accounted for 10% or more of our revenues,
though one reseller accounted for 17% of our revenues. At December 31, 1997, six
resellers represented approximately 55% of our outstanding accounts receivable
balance. In 1998, no end-user customer or reseller accounted for 10% or more of
our revenues. At December 31, 1998, six resellers represented approximately 41%
of our outstanding accounts receivable balance. For the six months ended June
30, 1999, no end-user customer or reseller accounted for 10% or more of our
revenues. At June 30, 1999, six resellers represented approximately 36% of our
outstanding accounts receivable balance. A significant number of resellers added
over the past year are non-North American and our average contract size has
increased. We believe that the allowance for doubtful accounts at June 30, 1999
is reasonable given the rapid expansion of our business, the recent non-North
American influence on our expansion and the increase in the average size of our
contracts. See Note 7 of our notes to consolidated financial statements.

                                       23
<PAGE>
HISTORICAL RESULTS OF OPERATIONS

    The following table sets forth, for the periods indicated, our consolidated
financial information expressed as a percentage of total revenues.

<TABLE>
<CAPTION>
                                                                                                                   SIX MONTHS
                                                                            YEAR ENDED DECEMBER 31,              ENDED JUNE 30,
                                                                     -------------------------------------  ------------------------
                                                                        1996         1997         1998         1998         1999
                                                                     -----------  -----------  -----------  -----------  -----------
<S>                                                                  <C>          <C>          <C>          <C>          <C>
Revenues:
  Software.........................................................         --           80%          85%          88%          75%
  Services.........................................................         --           20           15           12           25
                                                                           ---          ---          ---          ---          ---
Total revenues.....................................................         --          100          100          100          100
Costs and expenses:
  Costs of software................................................         --            2            1            1            1
  Costs of services................................................         --           79           37           41           32
  Sales and marketing..............................................          *          159           73           80           62
  Research and development.........................................          *          133           45           54           41
  General and administrative.......................................          *           47           16           17           16
                                                                           ---          ---          ---          ---          ---
Total costs and expenses...........................................          *          420          172          193          152
                                                                           ---          ---          ---          ---          ---
Operating loss.....................................................          *         (320)         (72)         (93)         (52)
Interest expense, net..............................................          *           23           10           13            5
                                                                           ---          ---          ---          ---          ---
Loss before income taxes...........................................          *         (343)         (82)        (106)         (57)
Income taxes.......................................................          *           --           --           --           --
                                                                           ---          ---          ---          ---          ---
Net loss...........................................................          *         (343)%        (82)%       (106)%        (57)%
                                                                           ---          ---          ---          ---          ---
                                                                           ---          ---          ---          ---          ---
</TABLE>

- ------------------------

*   Not a meaningful number because no revenues were recognized in 1996.

COMPARISON OF SIX MONTHS ENDED JUNE 30, 1998 AND 1999

REVENUES

    Our total revenues increased 115% from $3.4 million for the six months ended
June 30, 1998 to $7.3 million for the six months ended June 30, 1999. Non-North
American revenues were $247,000 for the six months ended June 30, 1998 and $1.5
million for the six months ended June 30, 1999. The increase in total revenues
resulted primarily from significant increases in the number of software licenses
and, to a lesser extent, professional services and product maintenance revenues.
We anticipate that software revenues will continue to represent the majority of
our revenues for the foreseeable future.

    SOFTWARE.  Our software revenues increased 83% from $3.0 million for the six
months ended June 30, 1998 to $5.5 million for the six months ended June 30,
1999. This increase in software revenues resulted from a significantly higher
number of software licenses as a result of the continued market acceptance of
EIC, product enhancements and a broader geographic presence as a result of the
establishment of sales offices in Europe and the Asia/Pacific region. In
addition, the number of additional licenses to existing end-user customers has
also increased.

    SERVICES.  Services revenues increased from $407,000 for the six months
ended June 30, 1998 to $1.8 million for the six months ended June 30, 1999. This
increase in services revenues resulted primarily from an increase in product
maintenance revenues, which grew significantly due to our expanding installed
base of end-user customers. In addition, our recently established professional
services organization generated increased implementation and customization
revenues from services

                                       24
<PAGE>
provided to our resellers and end-user customers. Also, demand for training from
both existing and new resellers and, to a lesser extent, end-user customers
translated into increasing education revenues.

COSTS AND EXPENSES

    As a percentage of total revenues, our total costs and expenses decreased
from 193% for the six months ended June 30, 1998 to 152% for the six months
ended June 30, 1999. This decrease resulted primarily from revenues increasing
faster than expenses. Our total costs and expenses primarily reflect our
investments in research and development, marketing, sales and services efforts.
Our total costs and expenses increased from $6.6 million for the six months
ended June 30, 1998 to $11.1 million for the six months ended June 30, 1999. The
increase in total costs and expenses resulted from substantial investments in
these efforts.

    COSTS OF SOFTWARE.  Costs of software consist primarily of product royalties
paid to third-parties for the use of their technologies in our products. Costs
of software increased from $24,000 for the six months ended June 30, 1998 to
$60,000 for the six months ended June 30, 1999, representing 1% of software
revenues in both periods. The increase resulted primarily from an increase in
the number of end-user customers and related software licenses.

    COSTS OF SERVICES.  Costs of services consist primarily of compensation
expenses for technical support, education and professional services personnel
and other costs associated with supporting our resellers and end-user customers.
Costs of services increased from $1.4 million for the six months ended June 30,
1998 to $2.4 million for the six months ended June 30, 1999. This represents
341% of service revenues for the six months ended June 30, 1998 and 129% of
service revenues for the six months ended June 30, 1999. The increase in amount
was due to a concentrated effort to maximize both reseller effectiveness and
end-user customer satisfaction through the growth of our technical support,
education and professional services organizations.

    SALES AND MARKETING.  Sales and marketing expenses consist primarily of
marketing expenses, including trade shows, public relations, telemarketing
campaigns and other promotional expenses, compensation expenses, including
commissions, and travel expenses. Sales and marketing expenses increased from
$2.7 million for the six months ended June 30, 1998 to $4.6 million for the six
months ended June 30, 1999. The increase in amount reflects the hiring of
additional North American, European and Asia-Pacific sales and marketing
personnel and expanded marketing activities.

    RESEARCH AND DEVELOPMENT.  Research and development expenses consist
primarily of compensation expenses for our developers and, to a lesser extent,
third-party efforts to adapt our products for specific countries. Research and
development expenses increased from $1.8 million for the six months ended June
30, 1998 to $3.0 million for the six months ended June 30, 1999. Currently, all
costs related to research and development of our products are charged to
research and development expense as incurred. The increase in research and
development expenses related primarily to the addition of software developers
required to enhance existing products and develop related products, and
third-party efforts to adapt our products for the Japanese and Korean markets.

    GENERAL AND ADMINISTRATIVE.  General and administrative expenses consist
primarily of compensation for our administrative, financial and information
technology personnel and a number of non-allocable costs, including bad debts
and professional service fees, such as legal and accounting fees. General and
administrative expenses increased from $590,000 for the six months ended June
30, 1998 to $1.1 million for the six months ended June 30, 1999. The increase
resulted primarily from the addition of personnel to support the growth of our
business and an increased amount of professional service fees.

                                       25
<PAGE>
INTEREST EXPENSE, NET

    Interest expense, net is generated primarily from debt owed to our principal
stockholder and, to a lesser extent, from various commercial lines of credit and
capital lease lines of credit. Interest expense, net was $428,000 for the six
months ended June 30, 1998 and $398,000 for the six months ended June 30, 1999.
The amount of interest expense decreased due to a lesser amount of debt
outstanding during 1999.

INCOME TAXES

    For the six months ended June 30, 1998, we were an S-corporation. As an
S-corporation, any tax benefit flowed through to our stockholders. We were a
C-corporation during the six months ended June 30, 1999, but we did not
recognize a tax benefit during that period because of the uncertainty of
eventually realizing these benefits. See Note 9 of our notes to consolidated
financial statements.

COMPARISON OF FISCAL YEARS ENDED DECEMBER 31, 1996, 1997 AND 1998

REVENUES

    Our total revenues increased from none in 1996 to $1.6 million in 1997 and
$9.0 million in 1998. Non-North American revenues were $292,000 in 1997 and $1.4
million in 1998. We do not believe that the percentage increases in revenues
achieved in prior periods should be anticipated in future periods. We anticipate
that software revenues will continue to represent a majority of our revenues for
the foreseeable future.

    SOFTWARE.  Our software revenues increased from none in 1996 to $1.3 million
in 1997 and $7.7 million in 1998. The increase in software revenues from 1996 to
1997 resulted primarily from the release of our first product, EIC, and our
initial North American sales efforts. The increase in software revenues from
1997 to 1998 resulted from a growing market acceptance of EIC, our growing sales
and marketing efforts and product-related functional and performance
enhancements.

    SERVICES.  Services revenues increased from none in 1996 to $325,000 in 1997
and $1.3 million in 1998. The increase in services revenues from 1996 to 1998
resulted primarily from the growth in maintenance revenues as our installed
customer base increased over the two-year period. In addition, we established
our educational services in 1997 and our professional services in 1998. The
establishment of these services has translated into an increasing amount of
revenues over the two-year period. We expect product maintenance revenues, which
account for a majority of our services revenues, to increase substantially for
the foreseeable future, primarily as a result of our growing installed customer
base. We also expect education and professional revenues to increase, primarily
as a result of increased reseller demand for technical and sales training and
the growth of our internal professional services group.

COSTS AND EXPENSES

    As a percentage of total revenues, our costs and expenses decreased from
420% in 1997 to 172% in 1998. This decrease resulted primarily from revenues
increasing faster than expenses. Our total costs and expenses increased from
$1.3 million in 1996 to $6.7 million in 1997 and $15.5 million in 1998,
primarily reflecting substantial increases in investments in our research and
development, marketing, sales and services efforts over the two-year period.
These investments included headcount additions of 48 employees in 1997 and 60
employees in 1998.

    COSTS OF SOFTWARE.  Costs of software increased from none in 1996 to $38,000
in 1997 and $59,000 in 1998, representing 3% of software revenues in 1997 and 1%
of software revenues in 1998. The increases in amount from 1996 to 1998 resulted
primarily from our growing end-user customer base.

                                       26
<PAGE>
We expect product royalties to grow as software revenues continue to increase
and we integrate additional third-party functions and features into our product
offerings.

    COSTS OF SERVICES.  Costs of services increased from none in 1996 to $1.3
million in 1997 and $3.4 million in 1998. The increases from 1996 to 1998
reflect the hiring of additional technical support, education and field services
personnel in excess of related revenues. We expect to make continued investments
in our service organizations to support our end-user customer base and
resellers. However, we expect that costs of services will increase at a slower
rate than services revenues.

    SALES AND MARKETING.  Sales and marketing increased from $157,000 in 1996 to
$2.5 million in 1997 and $6.6 million in 1998. The increases in sales and
marketing expenses from 1996 to 1998 resulted primarily from our initial and
ongoing investment in sales and marketing personnel. This investment included
the establishment of the initial North American field sales offices in 1997 and
European and Asian/Pacific region sales offices in 1998. In addition, we
increased our marketing activities, including tradeshows, public relations
activities and advertisements, over the two-year period. We currently plan to
continue investing significantly in sales and marketing efforts.

    RESEARCH AND DEVELOPMENT.  Research and development expenses increased from
$1.0 million in 1996 to $2.1 million in 1997 and $4.1 million in 1998. The
increases in research and development expenses from 1996 to 1998 related
primarily to the increase in software developers and testing personnel to
develop and enhance EIC and related products. We believe that our significant
investment in research and development has been critical to our market
acceptance to date and will continue to be so in the future.

    GENERAL AND ADMINISTRATIVE.  General and administrative expenses increased
from $192,000 in 1996 to $742,000 in 1997 and $1.4 million in 1998. The
increases from 1996 to 1998 were primarily due to the addition of personnel
necessary to support our growing operations. We believe our general and
administrative expenses will continue to increase as we expand our
administrative infrastructure and incur expenses associated with becoming a
public company.

INTEREST EXPENSE, NET

    Interest expense, net was $43,000 in 1996, $361,000 in 1997 and $868,000 in
1998. The increases from 1996 to 1998 resulted primarily from significant
increases in debt payable to our principal stockholder, various commercial lines
of credit and the interest portion of capital leases. See Notes 3 and 4 of our
notes to consolidated financial statements.

INCOME TAXES

    We were an S-corporation until November 5, 1998. As an S-corporation, any
tax benefit flowed through to our stockholders. As a result, we did not realize
any tax benefit from our net losses through November 5, 1998. We were a
C-corporation for approximately two months in 1998, but we did not recognize a
tax benefit because of the uncertainty of eventually realizing these benefits.
See Note 9 of our notes to consolidated financial statements.

                                       27
<PAGE>
QUARTERLY RESULTS OF OPERATIONS

    The following table sets forth, for the periods indicated, our consolidated
financial information for the last nine quarters expressed in dollars and as a
percentage of total revenues. We prepared this information using our unaudited
interim consolidated financial statements that, in our opinion, have been
prepared on a basis consistent with our annual consolidated financial
statements. We believe that these interim statements include all adjustments,
consisting only of normal recurring adjustments, necessary for a fair
presentation of this information when read in conjunction with our consolidated
financial statements and the notes to those financial statements. The operating
results for any quarter do not necessarily indicate the results to be expected
for any future period.
<TABLE>
<CAPTION>
                                                                       QUARTER ENDED
                           -----------------------------------------------------------------------------------------------------
                           JUNE 30,   SEPT. 30,   DEC. 31,   MARCH 31,   JUNE 30,   SEPT. 30,   DEC. 31,   MARCH 31,   JUNE 30,
                             1997       1997        1997       1998        1998       1998        1998       1999        1999
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
<S>                        <C>        <C>         <C>        <C>         <C>        <C>         <C>        <C>         <C>
                                                                      (IN THOUSANDS)
Revenues:
  Software...............  $    130    $    246   $    889    $ 1,163    $  1,817    $  2,203   $  2,479    $ 2,372     $  3,110
  Services...............        43         132        150        151         256         437        505        647        1,179
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Total revenues...........       173         378      1,039      1,314       2,073       2,640      2,984      3,019        4,289
Costs and expenses:
  Costs of software......         4           7         27          8          16          17         18         24           36
  Costs of services......       297         364        446        648         739         937      1,057      1,068        1,292
  Sales and marketing....       492         667        943      1,192       1,523       1,782      2,126      2,091        2,462
  Research and
    development..........       453         558        671        834       1,003       1,035      1,193      1,363        1,641
  General and
    administrative.......       143         224        277        296         294         364        453        507          628
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Total costs and
 expenses................     1,389       1,820      2,364      2,978       3,575       4,135      4,847      5,053        6,059
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Operating loss...........    (1,216)     (1,442)    (1,325)    (1,664)     (1,502)     (1,495)    (1,863)    (2,034)      (1,770)
Interest expense, net....        70         111        146        184         244         238        202        189          209
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Loss before income
 taxes...................    (1,286)     (1,553)    (1,471)    (1,848)     (1,746)     (1,733)    (2,065)    (2,223)      (1,979)
Income taxes.............        --          --         --         --          --          --         --         --           --
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Net loss.................  $ (1,286)   $ (1,553)  $ (1,471)   $(1,848)   $ (1,746)   $ (1,733)  $ (2,065)   $(2,223)    $ (1,979)
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------

<CAPTION>

                                                         PERCENTAGE OF TOTAL REVENUES
<S>                        <C>        <C>         <C>        <C>         <C>        <C>         <C>        <C>         <C>

Revenues:
  Software...............        75%         65%        86%        89%         88%         83%        83%        79%          73%
  Services...............        25          35         14         11          12          17         17         21           27
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Total revenues...........       100         100        100        100         100         100        100        100          100
Costs and expenses:
  Costs of software......         2           2          3          1           1           1          1          1            1
  Costs of services......       172          96         43         49          36          35         35         36           30
  Sales and marketing....       284         176         91         91          73          68         71         69           57
  Research and
    development..........       262         148         65         63          48          39         40         45           38
  General and
    administrative.......        83          59         27         23          14          14         15         17           15
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Total costs and
 expenses................       803         481        229        227         172         157        162        168          141
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Operating loss...........      (703)       (381)      (129)      (127)        (72)        (57)       (62)       (68)         (41)
Interest expense, net....        40          29         14         14          12           9          7          6            5
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Loss before income
 taxes...................      (743)       (410)      (143)      (141)        (84)        (66)       (69)       (74)         (46)
Income taxes.............        --          --         --         --          --          --         --         --           --
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
Net loss.................      (743)%      (410)%     (143)%     (141)%       (84)%       (66)%      (69)%      (74)%        (46)%
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
                           --------   ---------   --------   ---------   --------   ---------   --------   ---------   ---------
</TABLE>

    Quarterly software revenues have generally increased in each of the nine
quarters ended June 30, 1999, due primarily to the increased market acceptance
of EIC and the growth of our reseller network. Quarterly services revenues have
also generally increased in amount in each of these quarters, due primarily to
recognition of product maintenance revenues attributed to our growing end-user
customer base and professional service revenues from our resellers and end-user
customers.

                                       28
<PAGE>
    Total operating expenses increased in amount in each of these quarters.
Since inception, we have increased our spending in every functional area of the
organization. However, the percentage increases in spending for each quarter
have generally been less than the percentage increases in our revenues for the
corresponding quarter. We anticipate that our operating expenses will increase
substantially for the foreseeable future as we continue to expand our research
and development, marketing, sales and services efforts. We anticipate that these
expenses could significantly precede any revenues generated by the increased
spending. If we do not experience significantly increased revenues from these
efforts, our business, financial condition or results of operations could be
materially adversely affected.

LIQUIDITY AND CAPITAL RESOURCES

    Since our inception, we have funded our operations primarily through equity
and debt infusions from our principal stockholder, Dr. Brown. We have also
entered into secured and unsecured commercial lines of credit guaranteed by Dr.
Brown, as well as equipment financing guaranteed by Dr. Brown. Through June 30,
1999, Dr. Brown's equity and debt investments totaled $12.2 million. In
addition, on November 5, 1998, Dialogic Investment Corporation made a $5.0
million equity investment by purchasing 600,000 shares of our common stock. As
of June 30, 1999, we had cash and cash equivalents of $87,000 and a working
capital deficit of $3.2 million.

    Our operating activities resulted in net cash outflows of $1.2 million in
1996, $4.5 million in 1997, $7.1 million in 1998 and $1.7 million for the
six-month period ended June 30, 1999. The operating cash outflows for these
periods resulted from significant investments in research and development,
sales, marketing and services, which led to operating losses. Payments for
software licenses ordered by our resellers are generally due 30 to 60 days after
receipt of a binding order. Similarly, payments for software licensed directly
to end-user customers are generally due 30 to 60 days after receipt of a signed
contract.

    To date, our investing activities have consisted primarily of capital
expenditures for property and equipment, including $1.7 million of capital
expenditures for the six-month period ended June 30, 1999. These capital
expenditures have consisted primarily of computer hardware and software for our
growing employee headcount, our research and development needs and equipment and
furniture related to the recent move to our current headquarters location. At
June 30, 1999, we did not have any material commitments for future capital
expenditures.

    Financing activities have consisted primarily of the issuance of debt and
equity to Dr. Brown, the guaranteed borrowings under commercial lines of credit,
and the equity investment by Dialogic Investment Corporation. At June 30, 1999,
we had $1.1 million outstanding on our accounts receivable line of credit and
were in compliance with all related financial covenants and restrictions. We
currently anticipate that we will continue to experience significant growth in
our operating expenses for the foreseeable future as we expand our research and
development, marketing, sales and services operations.

    In connection with this offering, we intend to replace our existing credit
facilities with a new $5.0 million unsecured line of credit from our primary
lender. We have received a commitment letter for this facility. The commitment
letter is subject to the completion of this offering, the negotiation and
execution of definitive documents and other customary conditions. We anticipate
that amounts borrowed under the new credit facility will bear interest at the
lender's prime rate. Dr. Brown will not be required to guarantee the new credit
facility. We anticipate that the new credit facility will contain covenants
that, among other things, will limit our ability to incur additional
indebtedness and pay dividends and will require us to maintain prescribed debt
to equity and fixed charge coverage ratios and minimum net worth levels.
Although we believe we will successfully meet the requirements to obtain this
credit facility, we cannot assure you that we will be able to do so.

                                       29
<PAGE>
    We believe that the net proceeds of this offering, together with existing
cash and cash equivalents and amounts available under the new credit facility,
will be sufficient to meet our working capital and capital expenditure
requirements for at least the next 12 months. After that time, we may require
additional funds to support our working capital requirements or for other
corporate purposes and may seek to raise additional funds through public or
private equity or debt financings or from other sources. We cannot assure you
that additional financing will be available at all or that, if available, will
be on terms favorable to us or that any additional financing will not dilute
your ownership interest in Interactive Intelligence. See "Risk Factors--We may
not be able to obtain adequate financing to implement our growth strategy."

YEAR 2000 COMPLIANCE

    Many currently installed computer systems are not capable of distinguishing
21st century dates from 20th century dates. As a result, beginning on or before
January 1, 2000, computer systems and software used by many companies and
organizations in a wide variety of industries will produce erroneous results or
fail unless they have been modified or upgraded to process date information
correctly. Significant uncertainty exists in the software industry and other
industries concerning the scope and magnitude of problems associated with the
century change.

    We have addressed or are addressing the Year 2000 issues in the following
principal areas:

    - our software products, including third-party products we embed or license;

    - internal technology systems, including non-information technology systems;

    - key suppliers and resellers; and

    - end-user customers.

We have not retained any independent parties to verify or validate our
evaluation of Year 2000 issues or any related cost estimates.

    OUR SOFTWARE PRODUCTS

    We have warranted that all of our current products are Year 2000 compliant.
We continuously test our newly developed software for Year 2000 compliance, and
as of this date, are not aware of any problems related to Year 2000 compliance
for software products we are currently distributing. However, our products are
sometimes integrated into enterprise systems involving sophisticated hardware
and complex software products developed by third parties. Further, we embed in
our products other parties' software products, including products from our two
material suppliers, Dialogic Corporation and Microsoft Corporation. Our two
material suppliers have not warranted that their products which could impact the
performance of our products are Year 2000 compliant. We cannot adequately
evaluate third-party products for Year 2000 compliance. Based on our assessments
to date, we believe that we will not experience any material disruption as a
result of any Year 2000 problems. However, if our products or the third-party
products we embed have Year 2000 problems, our most reasonably likely worst case
scenario is that we could lose current or potential customers, incur costs
related to replacing third party products, face claims based on Year 2000
problems under our warranties, or otherwise, based on Year 2000 problems in
other companies' products or issues arising from the integration of multiple
products within an overall system, any of which could have a material adverse
effect on our business, financial condition or results of operations. Since we
are in the business of selling software, our risk of facing claims relating to
Year 2000 issues is greater than that of companies in some other industries.

                                       30
<PAGE>
    INTERNAL MANAGEMENT AND INFORMATION SYSTEMS

    We use a combination of our own software and other commercially available
software for our internal operations. At this time, we believe that there will
be no significant costs associated with the Year 2000 issue for internal
operations. We are not presently aware of any Year 2000 issues that have been
encountered by a third-party provider whose services are critical to us. We
intend to complete an evaluation of providers with respect to Year 2000
compliance by the end of September 1999. At the completion of the assessment we
will develop a contingency plan, if necessary, to address any Year 2000 issues.
We have also contacted the third parties who control our security systems,
electrical systems, heating and air conditioning systems, and other systems
related to the physical operation of our headquarters buildings that may contain
embedded technology, such as micro-controllers and microchip processors, to
assess whether any of these systems possess a Year 2000 problem that could
adversely affect our operations if a malfunction occurred. We have implemented
procedures to determine whether any of these systems that we acquire or utilize
in the future are also Year 2000 compliant.

    KEY SUPPLIERS AND RESELLERS

    We have begun to contact our key suppliers and intend to contact our key
resellers regarding Year 2000 issues. We are working to identify any key
suppliers and resellers that may have Year 2000 issues that could have an
adverse effect on our ability to deliver our products and services to customers.
We expect to complete this evaluation by the end of October 1999.

    END-USER CUSTOMERS

    We believe that the purchasing patterns of current and potential end-user
customers may be affected by Year 2000 issues as companies expend significant
resources to correct or upgrade their current software systems for Year 2000
compliance. These expenditures may reduce the funds available to license
software products such as those we offer. To the extent Year 2000 issues
significantly disrupt decisions to license our products or purchase our
services, our business, financial condition or results of operations could be
materially adversely affected.

    To date, we have not deferred any other information technology projects due
to our Year 2000 efforts and we have not incurred any material costs directly
associated with our Year 2000 compliance efforts. Our costs to date primarily
consist of compensation expense associated with our employees who have devoted
some of their time to our Year 2000 assessment and remediation efforts.
Currently, we do not expect the total cost of Year 2000 problems to be material
to our business, financial condition or results of operations. However, during
the months before the century change, we will continue to evaluate new versions
of our software products, new software and information systems provided to us by
third parties and any new infrastructure systems that we acquire to determine
whether they are Year 2000 compliant. Despite our current assessment, we may not
identify and correct all significant Year 2000 problems on a timely basis. Year
2000 compliance efforts may involve significant time and expense and
unremediated problems could materially adversely affect our business, financial
condition or results of operations. We currently have no contingency plans to
address the risks associated with unremediated Year 2000 problems. See "Risk
Factors--Year 2000 issues may adversely affect our business."

                                       31
<PAGE>
                                    BUSINESS

OVERVIEW

    We are a leading developer of enterprise software that allows our customers
to automate virtually every aspect of their business communications. When
installed on a Windows NT-Registered Trademark- server, our flagship product,
Enterprise Interaction Center-Registered Trademark- or EIC, provides a single,
integrated solution capable of processing thousands of interactions per hour,
including telephone calls, e-mails, faxes, voice mail messages, Internet chat
sessions, Web callback requests and voice over Net calls. EIC is a unique
software solution that replaces a variety of traditional devices such as private
branch exchange devices or PBXs, interactive voice response systems or IVRs,
automatic call distributors or ACDs, voice mail systems, fax servers, call
recorders and computer telephony integration or CTI gateways. We began licensing
our products in 1997 and have grown our revenues from $1.6 million in 1997 to
$9.0 million in 1998.

    We believe that EIC provides our end-user customers with an all-in-one
communications solution that has several advantages over the traditional
multi-device approach, including:

    - broader range of functions;

    - reduced need to integrate disparate technologies;

    - open architecture and better compatibility with leading technologies;

    - lower total cost of ownership; and

    - greater ability to customize communications to meet specific needs.

    We design our software to meet the needs of end-user customers in three
growing markets: call centers, enterprises and service providers. We license our
products to over 300 end-user customers, including Ameritech Corporation,
BuyItNow, Inc., Deutsche Telekom Berkom Gmbh, Seagate Technology, Inc. and
Toshiba America Consumer Products. We market our software products and services
through an extensive distribution network consisting of over 100 independent
value added resellers in North America, Europe and the Asia/Pacific region. Our
resellers range from relatively small, local organizations to large regional and
national firms, such as Bell South Communication Systems, Inc. and KPN Telecom
B.V. We also provide our end-user customers and resellers with a variety of
related services.

INDUSTRY OVERVIEW

    Due to a broad combination of factors, including deregulation, consolidation
and advances in technology, many organizations are looking to communications
technology to increase efficiency and provide better service. As a result, the
communications industry is experiencing significant changes. We believe we are
well positioned to take advantage of the following major trends taking place
within many industries:

    GROWTH OF CALL CENTERS

    In an increasingly competitive environment, businesses are attempting to
differentiate themselves with their customer service and support. Examples of
these businesses include recently deregulated industries such as financial
services and utilities. To consolidate customer contact points and focus on
customer service, organizations are frequently implementing formal call centers.
Putting a call center into place has traditionally required organizations to
purchase several different communications devices, such as a private branch
exchange or PBX, an interactive voice response system or IVR, an automatic call
distributor or ACD, a predictive dialer and a call logger, and then spend time
and money attempting to integrate these disparate devices. We believe that the
market for call center

                                       32
<PAGE>
communications products in 1998 represented approximately 55% of the estimated
$10.0 billion computer telephony industry, and we expect this market to grow at
25% to 30% annually.

    INCREASING VARIETY AND COMPLEXITY OF BUSINESS COMMUNICATIONS

    In addition to more traditional communications media such as telephone, fax
and voice mail, the growth of the Internet has expanded the number and
complexity of communications media to include e-mail, Internet chat sessions,
Web callback requests and voice over Net calls. We believe that approximately
one-fifth of customer contact will shift from the phone to the Internet in the
next two years. Additionally, most enterprises currently interact through these
media using separate devices, resulting in inefficient communication. These
circumstances are forcing organizations to re-evaluate their systems in order to
address the requirements of a more complex communications environment.

    INCREASING NEED TO INTEGRATE BUSINESS COMMUNICATIONS AND COMPUTER SYSTEMS

    Historically, telecommunications systems and information systems have been
separate and distinct. To more effectively and efficiently interact, both
internally and externally, we believe that enterprises need to seamlessly access
and utilize these two systems. Products, often referred to as middleware, have
been designed to integrate various types of telecommunications devices with
information technology. For example, an application called screen pop makes a
window pop up on an agent's monitor with information about a call at about the
same time that the agent's telephone or headset begins to ring. This allows the
agent to see all the information necessary to assist the customer. With
middleware, even simple applications, such as screen pop, are often difficult
and expensive to implement.

    We believe that the traditional approach of using middleware software
products to integrate communications and information systems suffers from a
number of fundamental problems. Implementing this type of solution is both
expensive and time consuming, often requiring many months or even years to
implement, and the total cost of ownership over time is high due to the multiple
points of configuration, administration and maintenance. Modification and
management of a traditional integrated infrastructure are also difficult since
each device is configured independently by different vendors. For instance,
hiring a new agent may require configuring a new extension in the PBX, defining
a new mail box in the voice mail system and creating a new agent entry in the
ACD. This process is not only expensive and time consuming, but may also result
in information being lost or inconsistently entered into each device. We also
believe that this traditional multi-device approach will make it more difficult
for enterprises to interact over the Internet and will require additional
devices and more integration, further complicating the current situation.

    We believe a new approach is required that does not attempt to resolve
differences among disparate devices, but rather provides a platform based on
standard hardware and software systems, a unified set of communications and
interaction services and seamless integration with information technology
components such as networks, servers, databases and desktop computers.

    ENTRANCE OF NEW SERVICE PROVIDERS

    For years, the regional Bell operating companies and other telephone
companies have provided voice mail, caller ID and other communications services
to consumers and small businesses. The Telecommunications Act of 1996
deregulated many aspects of the communications market and resulted in a rapid
increase in the number and types of organizations seeking to provide
communications services. These new service provider entrants include local
exchange carriers, cable companies, Internet service providers and wireless
companies.

    Generally, these organizations provide some sort of communications
connection into homes and businesses that they charge for on a regular basis. As
the price for connectivity declines rapidly, we believe that these organizations
may want to differentiate their offerings based on the enhanced

                                       33
<PAGE>
services they can provide. Examples of these services include unified messaging,
fax, interactive voice response, speech recognition, paging, conferencing, phone
numbers that follow the recipient of the call, and appointment scheduling. We
believe that the number of worldwide unified messaging mailboxes will grow from
an estimated 320,000 at the end of 1997 to more than 15.9 million by 2002. We
also expect service providers to implement Web-based services such as Web
callback, Internet chat sessions and voice over net.

    Traditionally, providing a wide range of voice and data interaction services
required service providers to interface different proprietary systems and incur
significant integration fees. We believe this creates the need for a new
platform for service providers that is flexible enough to deliver a variety of
enhanced services under a common administration and design architecture, while
at the same time lowering both the cost of entry and ongoing operation.

    In our opinion, the traditional multi-device approach to communications and
interaction by organizations is inadequate to address the needs created by these
trends. We believe that the shortcomings of this approach create a significant
opportunity for a single, all-in-one solution based on standard hardware and
software technology, such as a Windows NT-Registered Trademark- server, that
enables organizations to efficiently and effectively interact with all of their
constituents. We believe that we have developed such a solution.

INTERACTIVE INTELLIGENCE SOLUTION

    The Interactive Intelligence solution for call centers, enterprises and
service providers is an open software platform that, when installed on a server
running Windows NT-Registered Trademark-, provides a comprehensive set of
communications and interaction management services and requires little or no
integration. Our flagship product, EIC, is capable of processing thousands of
interactions per hour, including telephone calls, e-mails, faxes, voice mail
messages, Internet chat sessions, Web call-back requests and voice over Net
calls.

    We believe that the differentiating characteristics of the Interactive
Intelligence solution allow our end-user customers to more effectively
communicate and interact with their constituencies at a lower total cost of
ownership than through the use of traditional computer telephony integration
products. The strategic advantages of our single system approach are:

    BROADER RANGE OF FUNCTIONS.  Unlike traditional systems that require
end-user customers to purchase separate products to attain broader
functionality, EIC is an all-in-one system that offers a broad suite of
communications features, including telephony, inbound and outbound fax, e-mail
processing, automatic call distribution, interactive voice response,
conferencing, call recording, call monitoring and text chat processing. EIC also
includes facilities that allow supervisors to obtain numerous reports and to
view communications statistics in real time. We believe that, collectively,
these capabilities allow our customers to improve customer service and increase
internal efficiency.

    REDUCED NEED TO INTEGRATE DISPARATE TECHNOLOGIES.  Traditional
communications systems generally require significant integration efforts to get
their different components to work together effectively. This integration often
involves the purchase of expensive hardware, middleware and services. EIC pre-
assembles all of the necessary components into one software solution, allowing
end-user customers to concentrate their efforts on improving business
operations. Alternatively, EIC can be used to supplement the capabilities of a
PBX to provide Web-based interaction management, unified messaging, IVR or
departmental call center services.

    OPEN ARCHITECTURE AND BETTER COMPATIBILITY WITH LEADING
TECHNOLOGIES.  Traditional communications devices are based on proprietary,
closed architecture, which often limits the end-user customer's ability to
change or customize the products. Frequently, even simple changes such as adding
a new employee or changing an employee's location require intervention by the
vendor. Our products are built around

                                       34
<PAGE>
industry standard hardware and software components such as Intel microprocessors
and the Microsoft Windows NT-Registered Trademark- operating system. Our open
architecture allows end-user customers to configure our system to meet their
customized communications needs and to make hardware or software modifications
as necessary. For example, if one of our end-user customers needs more space for
voice mail recordings, it can simply purchase a larger disk drive on the open
market. Our products also interoperate easily with popular information
technology products, including:

    - e-mail servers, including Microsoft Exchange Server-Registered Trademark-
      and, in EIC Version 1.3, Lotus Notes-Registered Trademark-;

    - database systems, including those from Oracle Corp., Sybase, Inc.,
      Microsoft Corporation and IBM Corporation;

    - mainframe systems, including those that support 3270 and 5250 terminal
      emulation;

    - Web servers, including Microsoft IIS, Netscape and Apache;

    - network management systems, including HP OpenView, IBM Tivoli and CA
      Unicenter; and

    - customer relationship management systems, including those from Vantive
      Corporation, Clarify, Inc., Remedy Corp. and Onyx Software Corp.

    LOWER TOTAL COST OF OWNERSHIP.  We believe that our all-in-one solution
results in a lower total cost of ownership in comparison to traditional
communication systems with similar functionality, which typically consist of
multiple, disparate add-on components. For example, EIC's capabilities reside in
a single Windows NT-Registered Trademark- server with a software interface
designed for ease of use. As a result, all configuration and maintenance of our
products are confined to a single system. This results in a lower total cost of
ownership due to the reduced time and expense typically required to maintain a
centralized software-based communications system.

    GREATER ABILITY TO CUSTOMIZE COMMUNICATIONS TO MEET SPECIFIC NEEDS.  While
EIC can be deployed quickly with minimal configuration, organizations can also
customize many aspects of their communications processing using EIC's graphical
application generator. This means that EIC can serve as a platform upon which
organizations can build highly tailored communications processes for their
customers, employees or subscribers. It also means that end-user customers need
to learn only a single tool in order to customize their dial plans, call
distribution rules, interactive voice response menus, fax applications, Web
services, voice mail systems and other communications applications.

GROWTH STRATEGY

    Our primary business objective is to become the leading vendor of enterprise
software that allows call centers, enterprises and service providers to automate
virtually every aspect of their business communications. Our strategy for
achieving this objective incorporates the following key elements:

    CONTINUE TO EXPAND OUR LEADING TECHNOLOGY POSITION.  We have significant
technical expertise in call center, communications and software technologies. We
intend to use our expertise to add new features to our products to increase
their marketability in our three target markets. We also intend to improve the
ability of our current and future products to handle the needs of larger
organizations. We are currently developing technology that would allow EIC to
work effectively with the new H. 100 standard. If we are successful, EIC will be
able to meet the needs of call centers with up to 500 agents per site and
enterprises with up to 1,000 employees per site. We also plan to broaden the
compatibility of our products to work with other systems and applications used
by our end-user customers. For example, we intend to add support for the Novell
e-mail and directory services products, such as Groupwise and Novell Directory
Services or NDS, to increase our addressable market.

    BROADEN OUR PRODUCT OFFERING.  We plan to broaden our product offering with
additional products and features for our target markets. For the call center
market, we have developed and recently

                                       35
<PAGE>
released Interaction Dialer, which automates outbound calls, and we have
developed and are testing new products, including Interaction Director, which
efficiently distributes calls across multiple call centers. We also plan to
create new products and interfaces to third-party products to cover additional
areas such as agent performance evaluation and scheduling. For call centers and
enterprises we have developed and are testing e-FAQ, an automated e-mail
response product. For enterprises, we plan to add new applications including a
multimedia conference bridge and a speech-enabled personal assistant. For
service providers, we intend to add support for large-scale, Unix-based
messaging platforms that will allow service providers to handle tens of
thousands of subscribers for unified messaging, phone numbers that follow the
recipient of the call, and other enhanced services.

    FURTHER EXPAND OUR GLOBAL DISTRIBUTION CHANNEL.  We plan to further expand
our existing distribution channel, which currently consists of over 100
resellers in more than 20 countries. Our expansion efforts include a significant
focus on broadening our distribution channel in North America and we also plan
to expand our distribution channel in Europe and the Asia/Pacific region.
Currently, we have over 75 resellers and a 25-person field sales force that
manages, supports and develops our distribution channel in North America and
approximately 25 resellers and a four-person field sales force in Europe and the
Asia/Pacific region. We have also signed a reseller in South Africa and have
begun to sign resellers in Central and South America. We intend to continue to
broaden our geographic and market presence through our reseller coverage to
enhance our market share position.

    DEVELOP OUR STRATEGIC BUSINESS RELATIONSHIPS.  We have strategic
relationships with leading technology companies, including Dialogic Corporation,
Microsoft Corporation and Nuance Communications. As evidence of our commitment
to growth, Microsoft Corporation recently recognized us as the ninth fastest
growing independent software vendor using Microsoft
Windows-Registered Trademark-. In addition to our relationships with technology
companies, we intend to pursue strategic relationships with network equipment
vendors as well as developers of customer relationship management software to
build upon our comprehensive, turnkey solution. EIC complements both types of
products by utilizing the voice delivery capabilities of network devices such as
routers and switches, while providing the call center front-end capabilities
used in conjunction with customer relationship management applications. We also
intend to evaluate strategic acquisitions or investment opportunities for
products and technologies that complement or extend our existing products, offer
access to additional distribution channels or increase our customer base.

PRODUCTS

    We currently market and license our flagship product, Enterprise Interaction
Center-Registered Trademark- or EIC, as well as Interaction Recorder-TM-, a
complementary product that allows the user to easily log, record and retrieve
any call, and Interaction Dialer-TM-, a predictive dialing product that is
complementary to EIC. We have also developed and are currently testing
Interaction Director-TM-.

    ENTERPRISE INTERACTION CENTER-REGISTERED TRADEMARK- (VERSION 1.2)

    EIC turns a Windows NT-Registered Trademark- server containing the
appropriate voice processing boards into an all-in-one communications server.
Customers connect their telephone trunk lines, handsets and headsets to the EIC
server and gain an integrated communications system, capable of meeting an
organization's specific interaction processing requirements. We allow our
end-user customers to license all or some specific combinations of the features
of EIC.

                                       36
<PAGE>
    EIC provides organizations with a broad array of communications and
interaction processing capabilities, including:

    - Telephone system--allows end-users to place and receive telephone calls
      just like a private branch exchange or PBX. Analog trunks and digital
      trunks, such as T1/E1, ISDN and PRI, from the telephone company can be
      connected to an EIC server as well as the twisted pair connections to
      desktop phones. In addition to basic hold and transfer operations, EIC
      provides text-to-speech, speech recognition and support for conference
      calls with up to 32 participants.

    - Auto attendant--allows callers to locate specific individuals and
      departments and direct their own calls without involving receptionists.

    - IVR or interactive voice response--allows organizations to create
      self-service applications that their customers can access from their
      touch-tone phones. These applications can read and update information
      stored in databases and mainframe systems to perform account lookups and
      other operations.

    - ACD or automatic call distributor--organizes incoming calls into queues
      and distributes them to agents as they become available. Calls can be
      distributed on a first-come, first-served basis or make use of more
      complex methods such as skills-based routing. For example, some
      organizations may wish to service calls from important customers before
      servicing other calls.

    - Call recording--allows end-users to record their own calls and supervisors
      to record agent calls. EIC can also automatically record specified calls
      according to pre-defined rules--for example, every third call coming into
      a particular toll-free number or every call from a customer with a
      past-due balance.

    - Unified messaging--stores voice mail messages and faxes in Microsoft
      Exchange-Registered Trademark- mailboxes, from which end-users can
      retrieve them by phone, desktop computer or remotely over the Internet.
      This unified messaging capability is popular among our enterprise and
      service provider customers.

    - Web services--allows organizations to queue and distribute incoming
      Internet text chats as they do with telephone calls. For example, while
      browsing a company's Web site, a potential customer can click a button and
      use text chat to pose a question to a call center agent. EIC also includes
      tools that allow organizations to process incoming e-mail messages, Web
      callback requests and voice over Net calls.

    - Fax server--provides inbound and outbound fax services for the entire
      organization. Automatically detects incoming fax calls and includes
      support for fax broadcast, fax on demand, optical character recognition
      and other fax applications.

    - Graphical application generator--allows organizations to tailor EIC's call
      and interaction management functions to meet their specific needs and to
      integrate EIC into their information systems. EIC includes a graphical
      application generator called Interaction Designer-TM- that can be used to
      customize dial plans, call distribution rules, IVR scripts, fax services,
      Web interactions and other functions.

EIC also includes software that runs on desktop computers and provides
individuals with the following capabilities:

    - A software phone that allows individuals to visually manage calls from
      their desktop computer, including dialing, transferring, conferencing and
      recording. EIC includes both Win32 and Java versions to support a wide
      range of desktop operating systems.

    - On-screen company and department directories that allow individuals to
      quickly locate addresses, phone numbers and other employee information.

                                       37
<PAGE>
    - Real-time in-out boards that display the status, such as on the phone, at
      lunch or in a meeting, of other employees.

    - Management windows that allow supervisors to record and monitor calls as
      well as view real-time information for every queue, line, user, workgroup
      and station.

    - Desktop fax support that allows individuals to send and receive faxes from
      their desktop computers.

    - Screen pops that allow EIC to activate a particular application, such as a
      customer relationship management program, whenever an incoming call
      arrives. The activated application can display all the call information
      collected by EIC and provide call handling options including hold,
      transfer and conference.

    ENTERPRISE INTERACTION CENTER (VERSION 1.3)

    We released EIC Version 1.3 during July 1999. This enhanced version of EIC
has all of the capabilities of Version 1.2, and also provides approximately 50
new features and functions, including:

    - complete remote agent support that allows remote employees to handle
      calls, receive screen pops, send faxes, access phone directories, and
      otherwise communicate just as if they were in the office;

    - speech recognition capabilities;

    - support for Lotus Notes-Registered Trademark- for voice mail and unified
      messaging;

    - clustering of multiple servers for automatic recovery from failures;

    - optical character recognition to automatically convert faxes into
      documents; and

    - branch office connection that allows branch office employees to be a part
      of the headquarters telecommunication systems.

EIC Version 1.3 is available to our end-user customers that are currently
licensing EIC and using Version 1.2, as a product upgrade included in the
ongoing maintenance provided as a term of their license. Since the release of
EIC Version 1.3, our sales and marketing efforts, and those of our resellers,
are focused primarily on the licensing of Version 1.3. We intend to develop over
the next few months local language versions of EIC Version 1.3 for those
countries that currently have localized language for Version 1.2.

    INTERACTION RECORDER-TM- (VERSION 1.2)

    Interaction Recorder is a complementary product that enhances EIC's basic
call recording capabilities by providing recording management for organizations,
such as call centers and banks, that generate large numbers of recordings.
First, Interaction Recorder logs complete information about every recording,
such as customer name, account number and transactions selected, to a database.
Next, it compresses recordings by 87.5% to reduce storage requirements.
Interaction Recorder allows organizations to periodically archive groups of
recordings onto compact discs or other media and provides a user interface from
which supervisors and other employees can later search for particular recordings
and access them at any time.

    INTERACTION DIALER-TM-

    We recently released Interaction Dialer, a predictive dialing product that
is complementary to EIC. Predictive dialing is the process of automatically
making outbound calls to a list of phone numbers and quickly connecting to call
center agents any calls answered by a person. We developed Interaction

                                       38
<PAGE>
Dialer to provide call list management and answering machine detection. We have
created a sophisticated predictive algorithm that decides exactly how many calls
to place and when to make them in order to maximize the probability that an
agent will be available when a person answers a call.

    Interaction Dialer builds entirely upon EIC's facilities for automatic call
distribution, reporting and supervision, giving it blended capabilities for call
centers wishing to use agents for both inbound and outbound call processing. A
client-side component allows end-user customers to create visual call flow
scripts using any Web page editor. When an outbound call connects to an agent,
Interaction Dialer automatically pops a script that can display customer
information and lead the agent through the current call.

    INTERACTION DIRECTOR-TM- (IN TESTING)

    We are currently testing Interaction Director, a pre-call routing product
designed to efficiently distribute incoming calls across sites for multi-site
call centers. Given a data connection to the EIC server at each call center,
Interaction Director builds an in-memory database of near real-time information,
including current expected hold times at each site, queue lengths, number of
agents available and specific skills available. It then distributes incoming
calls based on this information and customized routing rules.

    Pre-call routing is the process of looking at a call while it is still in
the public switched telephone network and deciding to which location it should
be sent. Interaction Director currently supports the signaling system 7 or SS7
protocol and can thus be notified about new calls before they leave the
telephone network. Interaction Director can examine specific information about a
call and then use the up-to-date information in the in-memory database to decide
to which site to route the call. Once it has chosen a destination site,
Interaction Director signals its choice back to the telephone network. Pre-call
routing allows calls to be distributed efficiently across a collection of sites
and helps make effective use of agent resources. It also allows multi-site
organizations to provide superior customer service by minimizing wait times and
making sure that calls are routed to the sites best able to handle them. As an
example, Interaction Director could route calls from Spanish speaking customers
to a site with Spanish speaking agents. The end-user customer can create the
logic that determines where a given call is routed by using Interaction
Designer. AT&T Corporation has tested Interaction Director and determined that
it is interoperable with AT&T's Intelligent Call Processing Service, which
utilizes SS7. We are currently working to add support for MCI WorldCom Inc. and
other carriers.

    In addition to pre-call routing, Interaction Director will also support
post-call routing, which routes a call to another location after it has already
been delivered to a particular call center. For example, after a caller has been
on hold for more than a specified period of time, the end-user customer could
configure its EIC system to ask Interaction Director if another site would be
able to handle the call sooner. If so, the EIC system could then transfer the
call to that other location.

TECHNOLOGY

    We have developed a number of innovative technologies that underlie our
family of products, including:

    UNIVERSAL INTERACTION ENGINE.  At the core of EIC is an event-processing
engine that determines how different types of communications events are handled.
This engine makes use of the Java virtual machine to dispatch events, such as
incoming telephone calls, to software objects that process them. This approach
allows us to maximize our use of a widely used, multi-threaded interpreter to
handle large numbers of communications events under Windows
NT-Registered Trademark-. It also provides an architectural control point around
which we can create new services.

                                       39
<PAGE>
    NOTIFIER MESSAGING COMPONENT.  We have invented a sophisticated,
publish-subscribe messaging component called Notifier which allows all the
different portions of our products to communicate with each other using the
TCP/IP protocol. Different subsystems and applications register with Notifier
for events in which they are interested. As events flow through Notifier, it
forwards them on to the interested parties. This approach is more efficient than
simpler schemes which broadcast all events to all components. Our Notifier
architecture works especially well in wide area networks where efficient use of
bandwidth is critical. Notifier also allows components to be widely distributed
and to run over any TCP/IP connection, including the Internet. As a result, our
software phone and end-user fax tools can be installed on a work-at-home agent's
home computer and used over an Internet connection.

    GRAPHICAL APPLICATION GENERATOR.  Underlying our entire suite of products is
a single graphical application generator called Interaction Designer. This
development tool allows users to visually lay out logic that determines how
different types of events are to be processed. Interaction Designer includes a
tool palette of over one hundred objects that can be dragged into a workspace
and linked together. Once the handler for a particular event is complete,
Interaction Designer generates a Java class file, compiles it and executes it in
the universal interaction engine. This means that organizations can change the
ways in which different interactions are processed without restarting devices.

    GRAPHICAL ADMINISTRATIVE CONSOLE.  A single graphical application called
Interaction Administrator can be used to configure many different aspects of our
products. Supervisors can configure analog or digital telephone trunks, change
user profiles, define queues, add skills and perform many other common
administrative tasks from simple dialog boxes. Interaction Administrator
automatically sends out change notifications that are propagated via Notifier to
the various components that comprise our products. Thus, when a new employee is
added, his or her name automatically appears on agent and supervisor screens.

    DATABASE AND MAINFRAME CONNECTIVITY.  We have written software components
that provide access to information stored in most common relational database
systems, including those from Oracle Corp., Sybase Inc., Informix Corporation,
Microsoft Corporation and IBM Corporation, and mainframe systems supporting 3270
and 5250 emulation. These software components use advanced techniques like
connection caching to handle large numbers of transactions.

    PROGRAMMING INTERFACES.  We have created interfaces that allow customers to
integrate other software applications with EIC. On the server side, we have DLL
and TCP/IP socket-level interfaces that allow customers to add new functionality
to EIC and to communicate with applications running on other systems. On the
client side, we have both DDE and COM interfaces that make it possible to embed
EIC's capabilities into desktop applications.

    MULTI-SITE CALL ROUTING AND SS7 SUPPORT.  We are currently testing software
that allows us to communicate directly with public switched telephone networks
using the SS7 protocol. This allows us to receive advance notification from the
phone company of incoming calls and to tell the phone company where each call
should be sent in a multi-site environment. This is especially important for
call centers with multiple sites. If each site is running our EIC product and is
connected to a wide area network, we can collect near real-time information,
including number of calls in queue and number of agents available, and decide
which site is best able to handle new incoming calls.

RESEARCH AND DEVELOPMENT

    We believe that strong product development capabilities are essential to our
strategy of building on our position as a technological leader in our industry,
maintaining the competitiveness of our current products and adding new features,
functions and products. Our product development team consists of professionals
with expertise in software, telecommunications and computer hardware, many of
whom have years of experience at industry leading companies in these segments,
such as Microsoft

                                       40
<PAGE>
Corporation, Lucent Technologies, Inc. and Nortel Networks Corporation, formerly
known as Northern Telecom Limited. We believe that this combination of diverse
technical and communications expertise contributes to the highly integrated
functionality of our software products and provides us with a significant
competitive advantage.

    Currently, we are both a Microsoft Certified Developer as well as a
Microsoft Certified Solutions Provider. These designations give us early access
to Microsoft technology, allowing us to develop products more quickly and make
them interoperate more effectively with Microsoft products.

    Research and development expenses for the last three fiscal years were
approximately $1.0 million in 1996, $2.1 million in 1997, and $4.1 million in
1998. Our research and development staff has grown from 15 employees as of
December 31, 1996 to 27 employees as of December 31, 1997, 49 employees as of
December 31, 1998 and 60 employees as of June 30, 1999. We believe that
investment in research and development is important for us to maintain our
position in the industry and, therefore, intend to increase our spending for
research and development in the future.

CUSTOMER SERVICES AND SUPPORT

    We recognize the importance of offering quality service and support to our
resellers and end-user customers. Therefore, we provide a wide range of services
and support to both of these groups, including technical support for our
products, educational services, and professional services for implementing and
customizing our products. These services include the following:

    TECHNICAL SUPPORT SERVICES.  Our support services staff provides technical
support for both our resellers and end-user customers 24 hours a day, seven days
a week via phone, fax, e-mail and our Web site. We have support personnel in
Indianapolis and France, and also plan to open a support center in the
Asia/Pacific region. We utilize EIC, integrated with customer relationship
management software, to maximize the effectiveness of our support services.
Customer support services, along with product upgrades, are included in initial
and ongoing maintenance. Initial software license fees generally include one
year of maintenance. Generally, to continue using our software after this
initial period, our end-user customers must purchase annual ongoing product
maintenance.

    EDUCATIONAL SERVICES.  We place primary emphasis on providing a
comprehensive technical and sales education program to our resellers. We have
formal certification programs covering pre- and post-sales engineering,
installation and trouble shooting, implementation and project management, system
administration and application development. Several credits for our
supplementary or advanced educational offerings are included in our annual
reseller agreement and each subsequent annual renewal. For resellers and
end-user customers who would like additional supplementary or advanced training,
we offer classes that we bill on a per class basis.

    PROFESSIONAL SERVICES.  Our professional services staff supplements the
implementation and customization personnel of our resellers. We offer a wide
range of professional services for our end-user customers, including project
management, data systems integration and host connectivity. To further expedite
their implementation projects, end-user customers and resellers can select from
several pre-packaged fixed fee offerings. If desired, we also provide our
professional services on a time and materials basis.

SALES AND MARKETING

    We distribute our software products primarily through our network of
resellers. We also maintain a field sales force to support our resellers, as
well as engage in limited direct sales efforts. In addition, we engage in a
number of marketing activities to support our sales efforts. As of June 30,
1999, we employed 44 people in sales and marketing.

                                       41
<PAGE>
    RESELLERS

    We have a network of over 100 resellers that distribute our software
products in North America, Europe and the Asia/Pacific region. Our resellers
have a presence in more than 20 countries and 30 states. We have signed a
reseller in South Africa and have begun to sign resellers in Central and South
America. We intend to continue to broaden our geographic and market presence
through our reseller coverage in order to enhance our market share position.

    We believe that the use of a diversified network of resellers offers the
following advantages:

    - LARGER MARKET PRESENCE. The use of resellers allows us to have a broad
      market presence, by leveraging our resellers' existing sales
      infrastructure and other resources, without having to create these
      resources.

    - ACCELERATED MARKET PENETRATION. Our reseller network has allowed us to
      have significant market penetration faster than would have been possible
      with an in-house only sales staff.

    - INDUSTRY EXPERIENCE/TECHNICAL EDUCATION. Our goal is to recruit resellers
      that are highly trained, experienced and knowledgeable with respect to our
      specific markets, as well as business communications technologies. To
      qualify to be a reseller, an organization must have relevant telephony or
      data experience. We provide comprehensive technical and sales education
      with respect to our products to our resellers.

    - PRODUCT COMPARISON. When a reseller offers its customers a wide range of
      communications system options, including our products as well as other
      vendors' products, we believe the customer will be able to appreciate the
      advantages of our communications and interaction management software
      relative to traditional multi-device approaches. As a result, customers
      that are initially looking only to upgrade their existing systems may
      instead replace their entire system with EIC.

    FIELD SALES FORCE

    To help our resellers be as productive as possible, we have developed a
field sales force that manages, supports and assists in the development of our
resellers and reseller network. In North America, our field sales force is
located in California, Colorado, Florida, Georgia, Indiana, Minnesota, Missouri,
New Hampshire, New Jersey, New York, Ohio, Texas, Virginia and Wisconsin.
Internationally, our field sales force is located in France, Japan, the
Netherlands and the United Kingdom. Occasionally, our field sales force makes
direct sales to end-user customers.

    MARKETING

    Our marketing programs are designed to:

    - build market awareness of our communications and interaction management
      software;

    - generate qualified end-user customer leads; and

    - establish end-user customer preference for our products.

To accomplish these goals, we engage in a variety of marketing activities,
including seminars, tradeshows, direct mailings, public relations activities,
advertisements and Web site marketing.

                                       42
<PAGE>
CUSTOMERS

    We license our products to more than 300 end-user customers in North
America, Europe and the Asia/Pacific region, including:

<TABLE>
<S>                                            <C>
Ameritech Corporation                          E.I. du Pont de Nemours and Company
BMW Financial Services Italia (Italy)          Exit Marketing AB (Sweden)
Bob Barker Company, Inc.                       Fiserv, Inc.
Boxlight Corporation                           Los Alamos National Laboratory
BuyItNow, Inc.                                 NTS Marketing, Inc.
Caere Corporation                              Postel Australia (Australia)
Ceridian Corporation                           Seagate Technology, Inc.
Deutsche Telekom Berkom Gmbh (Germany)         Techmar Communications, Inc.
Direct Focus, Inc.                             Toshiba America Consumer Products
Dongbu Fire & Marine Insurance (Korea)
</TABLE>

No end-user customer or reseller accounted for 10% or more of our revenues in
1998 or for the six months ended June 30, 1999.

    The following are examples of call center and enterprise end-user customers
that use our communications and interaction management software:

    BUYITNOW, INC. is a Web-based retailer of many consumer-oriented products,
including home electronics, appliances, home decor items and toys. According to
BuyItNow, it prides itself on superior customer service driving strong customer
satisfaction. BuyItNow, with design and implementation assistance from one of
our resellers, built an integrated phone- and Web-based call center platform.
For phone-based customers, EIC is the PBX, IVR, ACD and fax server that connects
potential and existing customers with BuyItNow sales and service agents. For
customers who prefer Web-based interactions, BuyItNow has implemented EIC's chat
management capabilities to allow customers to chat with a BuyItNow Web-based
agent. The agent can respond efficiently to an inquiry by typing a short
message, selecting a standard reply, or directing the customer's Web-browser to
a specific BuyItNow Web page. Using EIC, BuyItNow directs both phone calls and
chat requests to agents using skills-based routing rules. According to BuyItNow,
it selected EIC over products from Lucent Technologies, Inc., Aspect and WebLine
because EIC met the call center's telephony needs and also provided the
Internet-based interaction capabilities necessary to attract and retain
Web-based customers.

    NTS MARKETING, INC. provides outsourced teleservices and fulfillment
services for organizations that do not have the internal infrastructure to
embark on significant marketing campaigns, such as mass advertising, or handle
the volume of inquiries that these campaigns often generate. For these
customers, NTS currently processes a volume of 15,000 to 20,000 calls per day.
According to NTS, after a thorough review of its business objectives, it
selected EIC as its technology centerpiece, because EIC provided a more flexible
communications system than its existing PBX and ACD devices could provide. With
EIC, NTS has gained, and currently uses, the functionality of multiple
telecommunications devices, including PBX, IVR, ACD, fax services, reporting
tools, unified messaging, call filtering/ blocking and recording capabilities.
NTS has also used EIC to create several custom call processing applications,
such as skills-based routing and HotEmails, which immediately send information
back to callers via e-mail while they are still on the phone. According to NTS,
these applications have reduced costs, improved productivity and enhanced
customer service. NTS believes that it would have been expensive and complex to
implement many of the time and money saving enhancements with traditional
telecommunications devices. According to NTS, EIC's open architecture allowed it
to proactively address many challenging and labor-intensive processes that were
having negative financial and competitive effects on its business.

                                       43
<PAGE>
    BOXLIGHT CORPORATION is a leading provider of liquid crystal display or LCD
projection products, digital input devices and presentation peripherals,
including slide creation, posters, powerpoint presentations, training and
creative services. Two years ago, Boxlight established a number of customer and
employee related communications objectives that, according to Boxlight, were not
possible to accomplish with its existing communications devices. As a result,
Boxlight implemented EIC in its Washington corporate offices as a complete
campus-wide solution and connected a satellite office in Tennessee to this EIC
system. With EIC, Boxlight has created a variety of enterprise applications. For
example, a remote employee can call an 800 number, enter an access code which is
validated against an authorization database and then place outgoing calls using
Boxlight's phone lines. Also, Boxlight has established a local/remote paging
system. From any phone at either Boxlight location, an employee can dial 01 and
speak a message, which is played over an internal intercom system at the
Washington corporate campus. Alternatively, an employee can dial 02 to speak
over the intercom system at the office in Tennessee. Boxlight has implemented
the chat feature of EIC on its newly designed Web site. This allows its Internet
customers real time access to sales and customer service representatives. EIC's
open architecture allows Boxlight to use its own resources to create these
enterprise communications solutions.

COMPETITION

    The market for our software products is highly competitive and, because
there are relatively low barriers to entry in the software market, we expect
competition to increase significantly in the future. We cannot assure you that
we will be able to compete effectively against current and future competitors.
Our competition currently comes from several different market segments,
including computer telephony platform developers, computer telephony
applications software developers and telecommunications equipment vendors. These
competitors include Apropos Technology, Aspect Telecommunications Corporation,
CELLIT, Inc., Cisco Systems, Inc., Davox Corporation, Genesys Telecommunication
Laboratories, Inc., Lucent Technologies, Inc., Melita International Corp.,
Quintus Corporation, Nortel Networks Corporation, Rockwell Electronic Commerce
and Siemens Nixdorf Information Systems AG/FI. We also compete to a lesser
extent with new or recent entrants to the marketplace. Our competitors vary in
size and in the scope and breadth of the products and services offered. See
"Risk Factors--We face competitive pressures, which may have a material adverse
effect on us."

INTELLECTUAL PROPERTY AND OTHER PROPRIETARY RIGHTS

    To protect our proprietary rights, we rely primarily on a combination of:

    - copyright, trade secret and trademark laws;

    - confidentiality agreements with employees and third parties; and

    - protective contractual provisions such as those contained in license and
      other agreements with consultants, suppliers, strategic partners,
      resellers and end-user customers.

    We have not signed agreements containing protective contractual provisions
in every case and the contractual provisions that are in place and the
protection they provide vary and may not provide us with adequate protection in
all circumstances. Despite our efforts to protect our proprietary rights,
unauthorized parties may copy aspects of our products and obtain and use
information that we regard as proprietary. Other parties may breach
confidentiality agreements and other protective contracts we have entered into,
and we may not become aware of these breaches or have adequate remedies for
them.

    We generally require our employees to enter into confidentiality agreements
containing non-disclosure, non-competition and non-solicitation provisions. When
they begin employment, our

                                       44
<PAGE>
employees also generally sign offer letters specifying the basic terms and
conditions of their employment.

    We currently do not hold any patents. However, we have filed provisional
patent applications relating to technology embodied in our software products. We
hold the registered trademarks for Interactive
Intelligence-Registered Trademark- and Enterprise Interaction
Center-Registered Trademark- in the U.S. and have trademark applications pending
in the U.S. for the following marks: Interaction Client, Interaction Designer,
Interaction Administrator, Interaction Recorder, Interaction Dialer, Interaction
Director, Interaction Web, Interaction Mail, Multimedia Queuing and our logo
design mark. In addition, we have trademark applications pending in several
foreign countries for the marks Interactive Intelligence and Enterprise
Interaction Center. All other trademarks and trade names referred to in this
prospectus are the property of their owners.

    We license some components of our products from third parties. If we were to
lose those licenses, we believe that we could obtain licenses from other sources
for similar components. However, if one or more of these licenses terminates or
cannot be renewed on satisfactory terms, we would have to modify the affected
products to use alternative components or technology or eliminate the affected
product function, either of which could have a material adverse effect on us.

    See "Risk Factors--Infringement claims could adversely affect us" for a
description of correspondence recently received by us from a large, well
capitalized competitor claiming that our products utilize technologies pioneered
and patented by it.

EMPLOYEES

    As of June 30, 1999, we had 167 employees worldwide, including 60 in
research and development, 43 in client services, 44 in sales and marketing and
20 in administration. Our future performance depends in significant part upon
the continued service of our key sales and marketing, technical and senior
management personnel and our continuing ability to attract and retain highly
qualified personnel. Competition for these personnel is intense and we cannot
assure you that we will be successful in attracting or retaining these personnel
in the future.

    We believe that we have a unique corporate culture that attracts highly
qualified and motivated employees. We emphasize teamwork, flexible work
arrangements, local decision making and open communications. Every employee has
been granted stock options. None of our employees is represented by a labor
union and, except for nine employees working in France who are required by
French law to be subject to a collective bargaining agreement, none of our
employees is subject to a collective bargaining agreement. We have not
experienced any work stoppages and we consider our relations with our employees
to be excellent.

FACILITIES

    We lease approximately 37,000 square feet of office space in our
headquarters building in Indianapolis, Indiana. As of June 30, 1999, the lease
required payments of approximately $3.4 million over the remaining term of the
lease, which expires on February 28, 2004. Before April 30, 1999, when we moved
into our current headquarters space, our headquarters were located in other
office buildings in Indianapolis, Indiana. We are continuing to lease some of
that space, which consists of two separate office suites totaling approximately
10,000 square feet, for use as training facilities. The leases under which we
lease both of these office spaces expire on March 1, 2004.

    We lease space for our research and development facility in Deerfield Beach,
Florida, which consists of approximately 5,700 square feet. The lease for that
facility ends on April 30, 2003. We also lease space for our various sales,
services and development offices located in Carlsbad, California; Los Angeles,
California; San Francisco, California; Denver, Colorado; Milford, Connecticut;
Atlanta,

                                       45
<PAGE>
Georgia; Norcross, Georgia; Stevensville, Maryland; St. Louis, Missouri;
Minneapolis, Minnesota; Marshalls Creek, Pennsylvania; Rockhill, South Carolina;
Reston, Virginia; France; Japan; and Korea. The majority of these leases are
short-term leases.

    We believe that our existing facilities are adequate for our current needs
and that additional space will be available as needed.

LEGAL PROCEEDINGS

    As of the date of this prospectus, we are not engaged in any legal
proceeding that we expect to have a material adverse effect on our business,
financial condition or results of operations.

    See "Risk Factors--Infringement claims could adversely affect us" for a
description of correspondence recently received by us from a large, well
capitalized competitor claiming that our products utilize technologies pioneered
and patented by it.

                                       46
<PAGE>
                                   MANAGEMENT

EXECUTIVE OFFICERS, DIRECTORS AND SIGNIFICANT EMPLOYEES

    The following table sets forth information about our executive officers,
directors and significant employees as of the date of this prospectus:

<TABLE>
<CAPTION>
NAME                                         AGE                                   POSITION
- ---------------------------------------      ---      ------------------------------------------------------------------
<S>                                      <C>          <C>
Donald E. Brown, M.D...................          43   Chairman of the Board, President and Chief Executive Officer
John R. Gibbs..........................          49   Executive Vice President of Administration and Corporate
                                                        Development, Treasurer and Director
Michael J. Tavlin......................          52   Chief Financial Officer
Jeremiah J. Fleming....................          41   Vice President of Sales, The Americas
Michael E. Ford........................          47   Vice President of Operations, Europe, Africa and Middle East
Douglas T. Shinsato....................          49   Vice President of Operations, Asia/Pacific
Keith A. Midkiff.......................          37   Vice President of Finance and Controller
Joseph M. Adams (1)....................          44   Vice President of Market Communications
Pamela Jo Hynes (1)....................          37   Vice President of Client Services
Michael D. Gagle, Ph.D. (1)............          48   Chief Scientist
Robert A. Greising (2).................          46   Secretary
Robert A. Compton......................          43   Director
Jon Anton, D.Sc........................          59   Director
Michael P. Cullinane...................          49   Director
</TABLE>

- ------------------------

(1) Significant employees, but not executive officers.

(2) Not an employee or executive officer.

    DONALD E. BROWN, M.D. co-founded his third software company, Interactive
Intelligence, in October 1994 and has served as Chief Executive Officer since
April 1995 and President since inception. Dr. Brown also serves as Chairman of
the Board, a position he has held since July 1998. Dr. Brown has been a director
since inception. In March 1988, Dr. Brown co-founded Software Artistry, Inc., a
developer of customer support software that became a public company in March
1995 and was subsequently acquired by IBM Corporation in January 1998. At
Software Artistry, Dr. Brown served as Chief Executive Officer and director from
inception through September 1994. Dr. Brown's first software company was
acquired by Electronic Data Systems, Inc. in September 1987. Dr. Brown graduated
from the Indiana University School of Medicine in 1985. He also holds two
additional degrees from Indiana University, a M.S. in computer science and a
B.S. in physics.

    JOHN R. GIBBS co-founded Interactive Intelligence in October 1994 and has
served as Executive Vice President of Administration and Corporate Development
since January 1995 and Treasurer since April 1995. Mr. Gibbs also served as
Secretary from April 1995 to January 1997. Mr. Gibbs has been a director since
April 1995. From March 1992 until October 1994, Mr. Gibbs was an independent
management consultant, serving mostly entrepreneurial and emerging growth
companies. He also has prior experience as an executive for high technology
companies. While a consultant, Mr. Gibbs served as the first Executive Director
of the Indiana Software Association. Mr. Gibbs holds a B.S. degree in business
economics and public policy from Indiana University. He also attended M.B.A.
school at Indiana University.

    MICHAEL J. TAVLIN has served as Chief Financial Officer since joining
Interactive Intelligence in June 1999. From June 1986 to June 1999, Mr. Tavlin
served as Vice President-Treasurer and Secretary of Aliant Communications Inc.,
a telecommunications company, which was recently acquired by

                                       47
<PAGE>
ALLTEL Corporation. From January 1979 until June 1986, Mr. Tavlin served as a
Senior Tax Manager with Coopers & Lybrand, which is now known as
PricewaterhouseCoopers, and Touche Ross & Co., which is now known as Deloitte &
Touche. Prior to that time, Mr. Tavlin was engaged in the practice of law. Mr.
Tavlin holds a B.A. degree in education from Oklahoma City University, a J.D.
degree from the University of Nebraska College of Law, and a LL.M. in Taxation
degree from Washington University in St. Louis.

    JEREMIAH J. FLEMING has served as Vice President of Sales, The Americas,
since joining Interactive Intelligence in March 1997. From January 1995 to
February 1997, Mr. Fleming served as Vice President, Domestic Sales of Software
Artistry. From 1992 to December 1994, he held sales positions of increasing
responsibility at Software Artistry, including Manager, Central Region Sales
from January 1993 to December 1994. He performed various sales capacities at
Pansophic Systems, Inc., a developer of business software, from 1989 to 1991,
concluding as the Midwest Regional Manager. Mr. Fleming holds both a M.B.A.
degree and a B.A. degree in political science and philosophy from the University
of Missouri.

    MICHAEL E. FORD has served as Vice President of Operations, Europe, Africa
and Middle East, since September 1998. Mr. Ford also served as Director of
Sales, Europe, Africa and Middle East from the time he joined Interactive
Intelligence in July 1997 until September 1998. From March 1994 to April 1997,
he served as Vice President of Sales of Enhanced Systems, Inc., a developer of
voice processing software. From March 1993 to March 1994, Mr. Ford served as
Vice President of Sales for Futurus Corporation, a developer of unified
messaging software. Mr. Ford's previous experience also includes establishing
and managing subsidiaries in Europe and Asia for Computer Corporation of America
and serving as Director of International Business for Hayes MicroComputer
Corporation. Mr. Ford holds a Masters in international business degree from the
University of South Carolina and a B.S. in business administration and economics
from the University of Pittsburgh in Kansas.

    DOUGLAS T. SHINSATO has served as Vice President of Operations,
Asia/Pacific, since joining Interactive Intelligence in May 1998. From April
1997 until April 1998, Mr. Shinsato served as Vice President of Asia Pacific of
Genesys Telecommunications Laboratories, a developer of computer telephony
integration software. From December 1995 to April 1997, he served as Executive
Vice President-Japan for AT Kearney, a subsidiary of Electronic Data Systems,
Inc., an information technology services and systems integrator. From December
1988 until December 1995, Mr. Shinsato was a senior partner in Deloitte Touche,
Tohmatsu's management consulting operations in Japan. Mr. Shinsato holds a
M.B.A. degree from the University of Southern California and a J.D. degree from
the Stanford Law School.

    KEITH A. MIDKIFF has served as Vice President of Finance since March 1999
and as Controller since joining Interactive Intelligence in February 1997. Mr.
Midkiff was Vice President of Finance and Chief Financial Officer of Alta
Analytics, Inc., a developer of data analysis software, from December 1996 to
February 1997. From June 1993 to December 1996, he served as Controller of
Software Artistry, which became a public company in March 1995. Mr. Midkiff
holds a M.B.A. degree from Indiana University and a dual B.S. degree in
accounting and finance from Ohio State University.

    JOSEPH M. ADAMS has served as Vice President of Market Communications since
joining Interactive Intelligence in December 1996. In 1988, Mr. Adams co-founded
Software Artistry with Dr. Brown. From 1988 to November 1995, Mr. Adams served
in a number of senior roles at Software Artistry, including Vice President of
Market Communications. From November 1995 to December 1996, Mr. Adams was
retired. He also previously served as a director at Software Artistry and three
separate Indianapolis based charities. Mr. Adams holds a B.S. degree in business
economics from Indiana University.

    PAMELA JO HYNES has served as Vice President of Client Services since
September 1999 and as Director of Client Services since joining Interactive
Intelligence in November 1996. Mrs. Hynes was an

                                       48
<PAGE>
Account Manager at Software Artistry from July 1996 to October 1996 and the
Support Services Manager of Software Artistry from August 1992 to July 1996.
Prior to August 1992, she served in a number of technical roles at Software
Artistry, including Application Development, Technical Instructor and Field
Engineer. Before joining Software Artistry, she served as Technical Support
Engineer at American Financial Resources, a software development company. Mrs.
Hynes holds a B.S. degree in management information systems from New Hampshire
College.

    MICHAEL D. GAGLE, PH.D. has served as Chief Scientist since March 1998. From
the time Dr. Gagle joined Interactive Intelligence in March 1995 until March
1998, he served as our Principal Software Engineer and Project Leader. Before
joining Interactive Intelligence, Dr. Gagle spent five years working on a
variety of applied projects at AT&T Bell Labs. Dr. Gagle's previous experience
also includes co-founding and serving as Vice President for Research and
Development for Micro Data Base Systems, Inc., a developer of PC database
systems, working on the technical staff of Microsoft Corporation and serving
from January 1994 to September 1994 as a senior developer with the Regenstrief
Institute for Health Care Research. Dr. Gagle holds a Ph.D. in management
information systems and a B.S. in industrial management from Purdue University.

    ROBERT A. GREISING has served as Secretary of Interactive Intelligence since
January 1997. He also served as a director from January 1997 to May 1999. Mr.
Greising is a partner in Krieg DeVault Alexander & Capehart, LLP, a law firm
located in Indianapolis, Indiana. He practices in the general corporate,
corporate finance and technology areas and chairs the Technology and Electronic
Commerce Practice Group of the firm. Mr. Greising also has experience with the
purchase and sale of software companies and the licensing of software. Mr.
Greising received his B.A. degree from DePauw University and his J.D. and M.B.A.
degrees from Washington University in St. Louis.

    ROBERT A. COMPTON has served as a director of Interactive Intelligence since
April 1995. He also served as Chairman of the Board from August 1995 to July
1998. Mr. Compton is currently President, Neurological Technologies Division of
Medtronic, Inc., a manufacturer of image guided surgery systems and medical
devices. From May 1997 until its acquisition, Mr. Compton was President and
Chief Operating Officer of Sofamor Danek Group, Inc., a publicly held medical
device manufacturer acquired by Medtronic, Inc. in January 1999. From 1988 until
May 1997, he served as general partner of CID Equity Partners, an
Indianapolis-based venture capital firm. From 1985 to 1988, Mr. Compton served
as Investment Manager with First Chicago Venture Capital. Mr. Compton has also
served as director for three publicly held companies, including Software
Artistry and Sofamor Danek Group, Inc., and over twelve privately held
companies. Mr. Compton holds a M.B.A. degree from Harvard University, and
received his undergraduate degree from Principia College.

    JON ANTON, D.SC. has served as a director of Interactive Intelligence since
May 1999. Dr. Anton is a researcher in the Purdue Call Center for
Customer-Driven Quality in the Department of Consumer Sciences at Purdue
University, a position he has held since 1993. He specializes in enhancing
customer service strategy through inbound call centers and teleweb centers using
telecommunications and computer technology, as well as the Internet. Dr. Anton
has assisted over 400 companies in the design and implementation of inbound and
outbound call centers. Dr. Anton holds Doctorate of Science and M.S. degrees in
technology from Harvard University, a M.S. degree from the University of
Connecticut and a B.S. degree from the University of Notre Dame. He also
completed the Executive Education program at the Graduate School of Business of
Stanford University.

    MICHAEL P. CULLINANE has served as a director of Interactive Intelligence
since May 1999. Mr. Cullinane is Executive Vice President and Chief Financial
Officer of PLATINUM TECHNOLOGY, INC., a publicly-held software company. He
joined PLATINUM in 1988 as its Chief Financial Officer. PLATINUM was recently
acquired by Computer Associates International. Mr. Cullinane is also a director
of Platinum Entertainment, Inc., a recorded music producer and licensing
company, Vasco Data Security, Inc., a security hardware and software company,
and Made2Manage Systems, Inc., an

                                       49
<PAGE>
enterprise software company. Mr. Cullinane holds a Bachelor's degree in business
administration from the University of Notre Dame.

    Executive officers of Interactive Intelligence serve at the discretion of
our board of directors. There is no family relationship between any of our
directors or executive officers.

BOARD OF DIRECTORS

    Our board of directors is divided into three classes that serve staggered
three-year terms. The term of the first class will expire at the annual meeting
of stockholders in 2000, the term of the second class will expire at the annual
meeting of stockholders in 2001, and the term of the third class will expire at
the annual meeting of stockholders in 2002. The terms of our current directors
will expire as follows:

    - 2000--Dr. Anton;

    - 2001--Mr. Cullinane and Mr. Gibbs; and

    - 2002--Dr. Brown and Mr. Compton

COMMITTEES OF THE BOARD OF DIRECTORS

    We have an Audit Committee and a Compensation and Stock Option Committee.
The Audit Committee consists of Dr. Anton and Mr. Cullinane. The Compensation
and Stock Option Committee consists of Mr. Compton, Dr. Anton and Mr. Cullinane.
The responsibilities of the Audit Committee are to recommend the appointment of
independent auditors, review with the independent auditors the scope and results
of the audit engagement, establish and monitor our financial policies and
control procedures, review and monitor the provisions of non-audit services by
our auditors and review all potential conflict of interest situations. See
"Certain Transactions." The responsibilities of the Compensation and Stock
Option Committee are to review, determine and establish the salaries, bonuses
and other compensation of our executive officers and to administer our stock
option plans.

COMPENSATION OF DIRECTORS

    No compensation was paid during 1998 to any of our directors for services as
a director. We will reimburse all directors for reasonable out-of-pocket
expenses incurred in connection with attending meetings of our board, including
committee meetings, but do not intend to pay them any cash stipends.
Non-employee directors will participate in our Outside Directors Stock Option
Plan. In connection with the election of Dr. Anton and Mr. Cullinane as
directors, we granted each of them an option to purchase 15,000 shares of our
common stock at an exercise price equal to the deemed fair market value of our
common stock on the date of the grant, based upon a determination by our board
of directors. See "Executive Compensation--Stock Option Plans--Outside Directors
Stock Option Plan" and "--Other Option Plans."

                                       50
<PAGE>
                             EXECUTIVE COMPENSATION

SUMMARY COMPENSATION TABLE

    The following table summarizes compensation paid by us for services rendered
in all capacities to us during 1998 to our Chief Executive Officer and to each
of our four other most highly compensated executive officers, based on salary
and bonus earned during 1998 (the "Named Executive Officers"). The amounts shown
as bonus were earned during 1998, but paid in the following year. The amounts
shown as long term compensation consist solely of options to acquire shares of
common stock. We have never granted stock appreciation rights or restricted
stock.

<TABLE>
<CAPTION>
                                                                                                    LONG TERM
                                                                                                  COMPENSATION
                                                                                                  -------------
                                                                                                     AWARDS
                                                                    ANNUAL COMPENSATION           -------------
                                                           -------------------------------------   SECURITIES
                                                                                   OTHER ANNUAL    UNDERLYING
NAME AND PRINCIPAL POSITION                                  SALARY      BONUS     COMPENSATION      OPTIONS
- ---------------------------------------------------------  ----------  ----------  -------------  -------------
<S>                                                        <C>         <C>         <C>            <C>
Donald E. Brown, M.D.
  Chairman, President and Chief Executive
  Officer................................................  $  100,000(1) $       --   $      --        67,500
John R. Gibbs
  Executive Vice President of Administration and
  Corporate Development and Treasurer....................  $   80,000  $       --    $   5,535(2)          --
Jeremiah J. Fleming
  Vice President of Sales, The Americas..................  $  154,808  $  106,327    $      --         11,250
Michael E. Ford
  Vice President of Operations, Europe, Africa, Middle
  East...................................................  $   91,032  $   57,026    $  73,359(3)      30,000
Douglas T. Shinsato
  Vice President of Operations, Asia/Pacific.............  $  100,000  $   66,666    $  55,077(4)      75,000
</TABLE>

- ------------------------

(1) Reflects salary earned during 1998, but deferred, without interest, at the
    election of Dr. Brown through July 1, 1999. This amount will be paid out of
    the net proceeds of this offering.

(2) Reflects medical premiums paid by us while we were an S-corporation, which
    are considered taxable income, and related tax gross-up payments.

(3) Reflects relocation expenses.

(4) Reflects housing allowance.

OPTION GRANTS DURING 1998

    The following table sets forth information with respect to options granted
under our stock option plans to the Named Executive Officers during 1998. The
dollar amounts under the potential realizable value columns are the result of
calculations that increase, at the 5% and 10% rates set by the Securities and
Exchange Commission, the initial public offering price of $13.00 per share and,
therefore, are not intended to forecast possible future appreciation, if any, of
the price of our common stock. We did not

                                       51
<PAGE>
use an alternative formula for a grant date valuation, as we are not aware of
any formula which will determine with reasonable accuracy a present value based
on future unknown or volatile factors.

<TABLE>
<CAPTION>
                                                      INDIVIDUAL GRANTS
                                   -------------------------------------------------------  POTENTIAL REALIZABLE VALUE
                                    NUMBER OF                                               AT ASSUMED ANNUAL RATES OF
                                   SECURITIES     % OF TOTAL                                 STOCK PRICE APPRECIATION
                                   UNDERLYING   OPTIONS GRANTED   EXERCISE OR                    FOR OPTION TERM
                                     OPTIONS    TO EMPLOYEES IN   BASE PRICE    EXPIRATION  --------------------------
NAME                                 GRANTED      FISCAL YEAR     (PER SHARE)      DATE          5%           10%
- ---------------------------------  -----------  ---------------  -------------  ----------  ------------  ------------
<S>                                <C>          <C>              <C>            <C>         <C>           <C>
Donald E. Brown, M.D.............      67,500(1)          9.2%     $    3.00      09/22/08  $  1,226,855  $  2,073,509
John R. Gibbs....................          --             --              --            --            --            --
Jeremiah J. Fleming..............      11,250(2)          1.5%          3.00      08/31/08       204,476       345,585
Michael E. Ford..................      30,000(2)          4.1%          3.00      08/31/08       545,269       921,560
Douglas T. Shinsato..............      75,000(2)         10.3%          2.67      05/29/08     1,387,922     2,328,649
</TABLE>

- ------------------------

(1) Non-qualified stock options to purchase our common stock, granted at 100% of
    the deemed fair market value of the common stock on the date of grant, based
    upon a determination by our board of directors. The options were immediately
    exercisable as of the date of grant.

(2) Incentive stock options to purchase our common stock, granted at 100% of the
    deemed fair market value of the common stock on the date of grant, based
    upon a determination by our board of directors. The options are exercisable
    at the rate of 20% per year, beginning on the first anniversary of the date
    of grant.

OPTION EXERCISES DURING 1998 AND YEAR-END OPTION VALUES

    The following table sets forth information about the exercise of options to
acquire our common stock by the Named Executive Officers during 1998, and
year-end option amounts and values. The value realized upon the exercise of
options is calculated based on the difference between the initial public
offering price of $13.00 per share and the option exercise price, multiplied by
the number of shares to which the exercise relates. The value of unexercised
in-the-money options at fiscal year-end is calculated based on the difference
between the initial public offering price of $13.00 per share and the option
exercise price, multiplied by the number of shares underlying the option.

<TABLE>
<CAPTION>
                                                             NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                            UNDERLYING UNEXERCISED     IN-THE- MONEY OPTIONS AT
                                 SHARES                   OPTIONS AT FISCAL YEAR-END        FISCAL YEAR-END
                               ACQUIRED ON     VALUE      --------------------------  ---------------------------
NAME                            EXERCISE      REALIZED    EXERCISABLE  UNEXERCISABLE  EXERCISABLE   UNEXERCISABLE
- -----------------------------  -----------  ------------  -----------  -------------  ------------  -------------
<S>                            <C>          <C>           <C>          <C>            <C>           <C>
Donald E. Brown, M.D.........          --   $         --      67,500             --   $    675,000   $        --
John R. Gibbs................     399,750      5,144,783     208,583             --      2,684,457            --
Jeremiah J. Fleming..........      22,500        272,925       2,250        110,250         27,293     1,313,370
Michael E. Ford..............          --             --       6,000         54,000         72,780       591,120
Douglas T. Shinsato..........          --             --          --         75,000             --       774,750
</TABLE>

STOCK OPTION PLANS

    1995 INCENTIVE STOCK OPTION PLAN

    On August 14, 1995, the board of directors and the then sole stockholder
adopted, and on November 11, 1997 and July 12, 1999, the board of directors
amended, the 1995 Incentive Stock Option Plan. Under the 1995 Incentive Stock
Option Plan, we had authority to award incentive stock options for up to
3,750,000 shares of our common stock to our employees, including officers.

    The 1995 Incentive Stock Option Plan was administered by the board of
directors until November 1997, when it began to be administered by an
administrative committee of the board.

                                       52
<PAGE>
Subject to the terms of the 1995 Incentive Stock Option Plan, the board of
directors or the administrative committee had the sole discretion and authority
to select those officers and employees to whom awards were made, to designate
the number of shares to be covered by each award, to establish vesting
schedules, to specify all other terms of the awards, subject to specified
restrictions, and to interpret the 1995 Incentive Stock Option Plan.

    Options granted under the 1995 Incentive Stock Option Plan generally become
vested 20% per year beginning on the first anniversary of the date of grant or
initial hire. Unvested options expire on the date the grantee's employment
terminates. Generally if the employment of a grantee of stock options under the
1995 Incentive Stock Option Plan terminates for any reason other than death or
disability, that grantee's vested options expire 30 days after the date of
termination. If the termination is on account of death or disability, the vested
options generally expire six months after termination. The 1995 Incentive Stock
Option Plan also provides that the board of directors can accelerate the vesting
of outstanding awards in the event of specified changes in control of our
company.

    Upon stockholder approval of the new 1999 Stock Option and Incentive Plan on
April 16, 1999, the board of directors determined that no new options will be
granted under the 1995 Incentive Stock Option Plan. Through April 16, 1999,
options for an aggregate of 2,016,735 shares of common stock were outstanding
under the 1995 Incentive Stock Option Plan.

    1995 NONSTATUTORY STOCK OPTION INCENTIVE PLAN

    On August 14, 1995, the board of directors and the then sole stockholder
adopted the 1995 Nonstatutory Stock Option Incentive Plan. Under the 1995
Nonstatutory Plan, we had authority to award stock options for up to 375,000
shares of our common stock to our employees, directors and consultants.

    The 1995 Nonstatutory Plan was administered by the board of directors.
Subject to the terms of the 1995 Nonstatutory Plan, the board of directors had
the sole discretion and authority to select those individuals to whom awards
were made, to designate the number of shares to be covered by each award, to
establish vesting schedules, to specify all other terms of the awards, subject
to specified restrictions, and to interpret the 1995 Nonstatutory Plan.

    Subject to the discretion of the board of directors, generally if the
service of a grantee of stock options terminates for any reason other than death
or disability, that grantee's options expire at the date of termination, other
than options held by a non-employee director. If the termination is on account
of death, the vested options generally expire 12 months after death. If the
termination is on account of disability, the vested options generally expire six
months after termination. The 1995 Nonstatutory Plan also provides that the
board of directors can accelerate the vesting of outstanding awards in the event
of specified changes in control of our company.

    Upon stockholder approval of the new 1999 Stock Option and Incentive Plan
and the new Outside Directors Stock Option Plan on April 16, 1999, the board of
directors determined not to issue any further options under the 1995
Nonstatutory Plan. Through that date, options for an aggregate of 14,250 shares
of common stock were outstanding under the 1995 Nonstatutory Plan.

    1999 STOCK OPTION AND INCENTIVE PLAN

    On April 14, 1999, the board of directors adopted, and on April 16, 1999,
the stockholders approved, the 1999 Stock Option and Incentive Plan (the "1999
Stock Option Plan"). Under the 1999 Stock Option Plan, we may award stock
options and shares of restricted stock to our officers, key employees,
consultants and other individuals as may be determined by the Compensation and
Stock Option Committee. The aggregate number of shares of common stock that may
be awarded under the

                                       53
<PAGE>
1999 Stock Option Plan is 3,750,000, subject to adjustment in specified events.
No individual participant may receive awards for more than 250,000 shares in any
calendar year.

    The 1999 Stock Option Plan is administered by the Compensation and Stock
Option Committee (the "Committee"). Subject to the terms of the 1999 Stock
Option Plan, the Committee has the sole discretion and authority to select those
officers, key employees and consultants to whom awards will be made, to
designate the number of shares to be covered by each award, to establish vesting
schedules, to specify all other terms of the awards, subject to specified
restrictions, and to interpret the 1999 Stock Option Plan.

    With respect to stock options under the 1999 Stock Option Plan that are
intended to qualify as incentive stock options under Section 422 of the Internal
Revenue Code, the option price must be at least 100% of the fair market value of
a share of common stock on the date of the grant of the stock option. For a
holder of more than 10% of the common stock, the option price must be at least
110% of the fair market value on the date of the grant of the stock option.
Incentive stock options may only be granted to employees. The Committee will
establish, at the time the options are granted, the exercise price of options
that do not qualify as incentive stock options ("non-qualified stock options").
An option granted under the 1999 Stock Option Plan may not be exercised more
than ten years from the date of grant, unless the Committee prescribes a shorter
period or unless some types of employment terminations require a shorter period.
An incentive stock option granted to a holder of more than 10% of the common
stock may not be exercised more than five years from the date of grant, unless
the Committee prescribes a shorter period or unless some types of employment
terminations require a shorter period. Under the 1999 Stock Option Plan, the
Committee may grant awards of restricted shares, in which case the grantee would
be granted shares of common stock, subject to such forfeiture provisions and
transfer restrictions as the Committee determines. Awards of options and shares
of restricted stock as to which restrictions have not lapsed are not
transferable other than under the laws of descent and distribution.

    Subject to the discretion of the Committee, generally if the employment of a
grantee of stock options is terminated for cause, or the employment of a grantee
of restricted shares is terminated for any reason other than death, disability
or retirement, that grantee's options expire and any restricted shares are
forfeited at the date of termination. A portion of a grantee's restricted shares
automatically become vested upon termination by reason of death or disability.
The board of directors may terminate or amend the 1999 Stock Option Plan at any
time; however, subject to certain exceptions, a grantee's consent must be
obtained if the change would impair the rights of that grantee and stockholder
approval must be obtained if required by applicable law or if the change
involves some types of increases in the number of shares subject to the 1999
Stock Option Plan. The 1999 Stock Option Plan also provides for accelerated
vesting of outstanding awards in the event of a change in control of our
company. As of June 30, 1999, options for an aggregate of 223,125 shares of
common stock were outstanding under the 1999 Stock Option Plan. Under the 1999
Stock Option Plan, we may make loans to grantees with respect to the income
taxes payable on restricted stock and the option price and income taxes payable
on the exercise of options.

    OUTSIDE DIRECTORS STOCK OPTION PLAN

    On April 14, 1999, the board of directors adopted, and on April 16, 1999,
the stockholders approved, an Outside Directors Stock Option Plan (the
"Directors Plan"). The Directors Plan was amended and restated by the board of
directors and the stockholders in July 1999. The Directors Plan reserves for
issuance 150,000 shares of our common stock, subject to adjustment in certain
events. Pursuant to the Directors Plan, each non-employee director will be
automatically granted an option to purchase 5,000 shares of common stock on June
1 of each year beginning June 1, 2000. The option exercise price per share will
be the fair market value of one share of our common stock on the date of grant.
Each option becomes exercisable six months following the date of grant and
expires ten years

                                       54
<PAGE>
following the date of grant. Subject to some exceptions, options may be
exercised by the holder only if he has been in continuous service on the board
of directors at all times since the grant of the option.

    OTHER OPTION PLANS
    On September 22, 1998, the board of directors granted an option to purchase
67,500 shares of our common stock to Dr. Brown. The board of directors granted
this option in consideration for guarantees by Dr. Brown of some of our
commercial lines of credit and equipment leases. The exercise price for this
option is $3.00, the deemed fair market value of our common stock on the date of
grant, based upon a determination by our board of directors. The option was
immediately exercisable in full as of the date of grant and can be exercised any
time within 10 years from the date of grant.
    On May 26, 1999, the board of directors granted an option to purchase 15,000
shares of our common stock to each of Dr. Anton and Mr. Cullinane in
consideration of their agreeing to become directors. The exercise price for
these options is $9.33, the deemed fair market value of our common stock on the
date of grant, based upon a determination by our board of directors. Options for
7,500 of the shares become exercisable one year after the date of grant and the
balance becomes exercisable two years after the date of grant. The options
expire ten years after the date of grant.

EMPLOYMENT AND NON-COMPETITION AGREEMENTS

    On January 2, 1995, we entered into a Consulting and Employment Agreement
with John R. Gibbs, which was amended on May 14, 1999. Under the agreement, Mr.
Gibbs serves as Executive Vice President of Administration and Corporate
Development. The term of Mr. Gibbs' employment was initially for 18 months
beginning July 1, 1995; however, the agreement provides that the term
automatically renews for successive one-year terms unless either we or Mr. Gibbs
gives notice. The agreement provides that Mr. Gibbs will receive an annual
salary of $60,000, which we may increase at our discretion, and a one-time grant
of incentive stock options to purchase up to 833,333 shares of our common stock.
We have since increased Mr. Gibbs' annual salary. See "--Summary Compensation
Table." Mr. Gibbs is also eligible to participate in employee benefit plans
generally available to our employees. The agreement also contains
non-competition, non-solicitation and non-disclosure provisions, which are in
effect during the term of the agreement. The non-disclosure provisions in Mr.
Gibbs' agreement continue indefinitely after his termination of employment. The
non-compete provisions continue for a period of 12 months after his termination
of employment for any reason, as do the non-solicitation provisions unless he is
terminated by us without cause. If his employment is terminated by us without
cause, or in specified circumstances following a change of control, Mr. Gibbs
will receive severance pay equal to 12 months' salary. Under the agreement, Mr.
Gibbs also served as a consultant to the Company from January 2, 1995 until June
30, 1995.

    On June 30, 1997, we entered into an Employment Agreement with Michael E.
Ford. The agreement provides that Mr. Ford will serve as Director of Sales in
Europe, Africa and Middle East. The term of Mr. Ford's employment agreement is
two years; however, the agreement provides that the term automatically renews
for successive one-year terms unless either we or Mr. Ford gives notice. The
agreement provides that Mr. Ford will receive an annual salary of $85,000, which
we may increase or decrease at our discretion with notice, and a one-time grant
of incentive stock options to purchase up to 30,000 shares of our common stock
under our 1995 Incentive Stock Option Plan. We have since increased Mr. Ford's
annual salary. See "--Summary Compensation Table." Mr. Ford also participates in
the bonus compensation program applicable to our sales employees and other
employee benefit plans generally available to our employees. The agreement also
contains non-competition and non-solicitation provisions, which are in effect
during the term of the agreement and for a period of 18 months following his
termination for any reason, and non-disclosure provisions. If his employment is
terminated by us for any reason other than for cause, Mr. Ford will receive
severance pay equal to one month's salary.

                                       55
<PAGE>
    On May 1, 1998, we entered into an Employment Agreement with Douglas T.
Shinsato. The agreement provides that Mr. Shinsato will serve as Vice
President-Asia Pacific. The term of Mr. Shinsato's employment agreement is two
years; however, the agreement provides that the term automatically renews for
successive one-year terms unless either we or Mr. Shinsato gives notice. The
agreement provides that Mr. Shinsato will receive an annual salary of $150,000,
which we may increase or decrease at our discretion with notice, and a one-time
grant of incentive stock options to purchase up to 75,000 shares of our common
stock under our 1995 Incentive Stock Option Plan. We have since increased Mr.
Shinsato's annual salary. See "--Summary Compensation Table." Mr. Shinsato also
participates in the bonus compensation program applicable to our sales employees
and other employee benefit plans generally available to our employees. The
agreement also contains non-competition and non-solicitation provisions, which
are in effect during the term of the agreement and for a period of 18 months
following his termination for any reason, and non-disclosure provisions. If his
employment is terminated by us for any reason other than for cause, Mr. Shinsato
will receive severance pay equal to one month's salary.

    On March 1, 1997, we entered into an Employment Agreement with Jeremiah J.
Fleming, which was amended on May 14, 1999. The agreement provides that Mr.
Fleming will serve as Vice President of Sales, The Americas. The term of Mr.
Fleming's employment agreement is two years; however, the agreement provides
that the term automatically renews for successive one-year terms unless either
we or Mr. Fleming gives notice. The agreement provides that Mr. Fleming will
receive an annual salary of $125,000, which we may increase or decrease at our
discretion with notice, and a one-time grant of incentive stock options to
purchase up to 112,500 shares of our common stock under our 1995 Incentive Stock
Option Plan. We have since increased Mr. Fleming's annual salary. See "--Summary
Compensation Table." Mr. Fleming also participates in the bonus compensation
program applicable to our sales employees and other employee benefit plans
generally available to our employees. The agreement also contains
non-competition, non-solicitation and non-disclosure provisions, which are in
effect during the term of the agreement. The non-disclosure provisions in Mr.
Fleming's agreement continue indefinitely after termination of his employment.
The non-compete provisions continue for a period of 12 months after termination,
as do the non-solicitation provisions unless he is terminated by us without
cause. If his employment is terminated by us without cause, or in specified
circumstances following a change of control, Mr. Fleming will receive severance
pay equal to one year's total compensation.

    On June 1, 1999, we entered into an Employment Agreement with Michael J.
Tavlin, which was amended on that same date. The agreement provides that Mr.
Tavlin will serve as Chief Financial Officer. The term of Mr. Tavlin's
employment agreement is two years; however, the agreement provides that the term
automatically renews for successive one-year terms unless either we or Mr.
Tavlin gives notice. The agreement provides that Mr. Tavlin will receive an
annual salary of $140,000, which we may increase or decrease at our discretion
with notice, and a one-time grant of stock options to purchase up to 82,500
shares of our common stock under our 1999 Stock Option and Incentive Plan. Mr.
Tavlin is also eligible for an annual bonus of up to $40,000 per year. The
agreement also contains non-competition, non-solicitation and non-disclosure
provisions, which are in effect during the term of the agreement. The
non-disclosure provisions in Mr. Tavlin's agreement continue indefinitely after
termination of his employment. The non-compete and non-solicitation provisions
continue for a period of 18 months after termination. If his employment is
terminated by us without cause, Mr. Tavlin will receive severance pay equal to
one month's salary. If Mr. Tavlin is terminated without cause after a change in
control, his salary and medical benefits will continue for one year after
termination.

    We do not have employment or non-competition agreements with any other Named
Executive Officers.

                                       56
<PAGE>
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

    During 1998, Donald E. Brown, M.D. and John R. Gibbs served as the only
members of the Administrative Committee, which administered our stock option
plans during 1998. The board of directors had all other responsibilities to
review, determine and establish the salaries, bonuses and other compensation of
our executive officers during 1998. Our board of directors during 1998 consisted
of Messrs. Brown, Compton, Gibbs and Greising. Messrs. Brown and Gibbs continue
to serve as officers and employees of Interactive Intelligence. Mr. Greising is
not an employee, but has been our Secretary since January 1997. Except for Dr.
Brown, none of the members of the Administrative Committee or our board of
directors during 1998 were involved in a relationship requiring disclosure as an
interlocking executive officer or director or under Item 404 of Regulation S-K.
Dr. Brown is a director and 25% stockholder of Intelligent Response, Inc., a
company that provides us with telemarketing and fulfillment services. Dr. Brown
has also loaned funds to us from time to time prior to this offering, has
elected to defer the payment of his salary, and has advanced other non-interest
bearing accounts payable to us. In addition, he has guaranteed our commercial
lines of credit, our equipment leases and two of our office leases. See "Certain
Transactions." Effective April 14, 1999, we no longer have an Administrative
Committee, and the Compensation and Stock Option Committee administers our stock
option plans. See "Management--Committees of the Board of Directors.

                                       57
<PAGE>
                              CERTAIN TRANSACTIONS

RELATIONSHIP WITH DIALOGIC

    Dialogic Investment Corporation owned 5.6% of the shares of our common stock
as of June 30, 1999. We have entered into agreements with Dialogic Corporation,
which is the parent of Dialogic Investment Corporation. Dialogic Corporation was
recently acquired by Intel Corporation. Under a Strategic Relationship Agreement
between us and Dialogic Corporation, which commenced on March 1, 1999, Dialogic
Corporation has agreed to provide us with voice processing boards for our use
related to EIC. Dialogic Corporation has also agreed to provide us with rebate
incentives and marketing, sales and technical support. This agreement is
non-exclusive, and Dialogic Corporation is free to market any of the voice
processing boards to other customers, including companies that may compete with
us. In addition, while we have agreed to provide Dialogic Corporation notice and
a reasonable opportunity to meet our current and future product needs, we are
also free to purchase competitive products if required for our business
purposes.

    The Strategic Relationship Agreement also provides that, at no cost to us,
Dialogic Corporation will provide us with an inventory of voice processing
boards valued in an amount up to $100,000, to be used exclusively for our
internal developmental and testing purposes. We may not resell this inventory
without written permission from Dialogic Corporation until after the end of the
three-year term of this arrangement. Dialogic Corporation's inventory
obligations under the Strategic Relationship Agreement terminate if we begin to
purchase a substantial portion of competitive products from other vendors. We
have already received all of the voice processing boards that Dialogic
Corporation is obligated to deliver. We believe that the Strategic Relationship
Agreement is on terms at least as favorable as we could obtain from an unrelated
third party.

    We are also a party to a Support Services Agreement with Dialogic
Corporation relating to technical and professional support services to be
provided by Dialogic Corporation to us arising from the installation,
configuration, programming and maintenance of specified Dialogic Corporation
products. The annual fee is $50,000, which was waived for one year beginning
March 1, 1999, plus reasonable travel and out-of-pocket expenses. We also incur
additional per hour fees for specified services such as standby coverage,
service calls within the standby period, on-site technical support and
consulting services. The Support Services Agreement also provides that we will
not solicit for employment any Dialogic Corporation personnel performing
services under the agreement. We believe that the Support Services Agreement is
on terms at least as favorable as we could obtain from an unrelated third party.

    We paid Dialogic Corporation $2,000 in 1996, $905,000 in 1997 and $871,000
in 1998 for voice processing boards and related technology and services. We
believe that these amounts were no greater than amounts which we would have paid
to unrelated third parties for similar products and services.

TELEMARKETING SERVICES

    Dr. Brown is a director and 25% stockholder of Intelligent Response, Inc., a
telemarketing company, and Dr. Brown's brother is the president of that company.
In 1998, Intelligent Response began providing us with telemarketing and
fulfillment services in support of our marketing efforts. We paid Intelligent
Response $111,000 in 1998 for these services. We believe that the amounts paid
to Intelligent Response were no greater than amounts that we would have paid to
unrelated third parties for similar services. We intend to continue to use
Intelligent Response to provide telemarketing and fulfillment services.

                                       58
<PAGE>
INSIDER ADVANCES

    From time to time before this offering, Dr. Brown loaned funds to us. These
loans have an interest rate of 10% and are due on December 31, 2001. All amounts
outstanding under these loans will be repaid with a portion of the net proceeds
from this offering. As of August 31, 1999, the aggregate amount outstanding
under these loans was $7.5 million, including accrued interest. We incurred no
interest expense on these loans in 1996, $228,000 in interest expense in 1997
and $686,000 in interest expense in 1998. In addition to these loans, Dr. Brown
has also elected to defer, without interest, the payment of all of his salary
from July 1, 1996 through June 30, 1999. As of August 31, 1999, we owed Dr.
Brown $214,000 in deferred compensation and $335,000 in other non-interest
bearing accounts payable. All of Dr. Brown's deferred compensation and these
other non-interest bearing accounts payable will be paid with a portion of the
net proceeds from this offering.

GUARANTEES OF OUR OBLIGATIONS

    From time to time before this offering, Dr. Brown has guaranteed our
commercial lines of credit and our equipment leases. In consideration for a
portion of these guarantees, we granted an option to purchase 67,500 shares of
our common stock to Dr. Brown on September 22, 1998. The stock option has an
exercise price of $3.00 per share, which was the deemed fair market value of our
common stock on the date of grant, based upon a determination by our board of
directors, and the option was immediately exercisable in full as of the date of
grant. In connection with this offering, we intend to replace our existing
credit facilities with a new unsecured line of credit from our primary lender,
which Dr. Brown will not be required to guarantee. In addition, Dr. Brown has
personally guaranteed two of our office leases. These guarantees and the
guarantee of our equipment leases will continue after this offering.

                                       59
<PAGE>
                       PRINCIPAL AND SELLING STOCKHOLDERS

    John R. Gibbs, the co-founder of Interactive Intelligence and a Named
Executive Officer, has granted the underwriters an option to purchase up to
70,000 shares of our common stock to cover over-allotments.

    The following table sets forth information regarding the beneficial
ownership of our common stock as of June 30, 1999 by Mr. Gibbs and by the
following individuals or groups:

    - each person, or group of affiliated persons, who is known by us to
      beneficially own more than 5% of the outstanding shares of our common
      stock;

    - each director;

    - each Named Executive Officer; and

    - all directors and executive officers as a group.

Unless otherwise noted, we believe that all persons named in the table have sole
voting and investment power with respect to all shares beneficially owned by
them. Percentage ownership in the following table is based on 10,700,121 shares
of our common stock outstanding as of June 30, 1999 and 13,370,121 shares of our
common stock outstanding after this offering, assuming that the underwriters do
not exercise their over-allotment options.

<TABLE>
<CAPTION>
                                                                                               PERCENTAGE OF SHARES
                                                                                                   OUTSTANDING
                                                                         NUMBER OF SHARES   --------------------------
                                                                           BENEFICIALLY      BEFORE THIS   AFTER THIS
NAME                                                                           OWNED          OFFERING      OFFERING
- -----------------------------------------------------------------------  -----------------  -------------  -----------
<S>                                                                      <C>                <C>            <C>
Donald E. Brown, M.D.(1)...............................................       8,675,079(2)         80.6%         64.6%
John R. Gibbs(1).......................................................         958,896             9.0%          7.2%
Jeremiah J. Fleming....................................................          47,250(3)            *             *
Michael E. Ford........................................................          12,000(4)            *             *
Douglas T. Shinsato....................................................          15,000(5)            *             *
Jon Anton, D.Sc........................................................              --              --            --
Robert A. Compton......................................................          22,500               *             *
Michael P. Cullinane...................................................              --              --            --
Dialogic Investment Corporation(6).....................................         600,000             5.6%          4.5%
All directors and executive officers as a group (10 persons)...........       9,745,725(7)         90.3%         72.4%
</TABLE>

- ------------------------

* Less than 1%.

(1) The address for these stockholders is 8909 Purdue Road, Suite 300,
    Indianapolis, IN 46268.
(2) Includes 67,500 shares subject to stock options exercisable within 60 days
    after June 30, 1999.

(3) Includes 2,250 shares subject to stock options exercisable within 60 days
    after June 30, 1999.

(4) Represents 12,000 shares subject to stock options exercisable within 60 days
    after June 30, 1999.
(5) Represents 15,000 shares subject to stock options exercisable within 60 days
    after June 30, 1999.

(6) The address for this stockholder is 1515 Route Ten, Parsippany, NJ 07054.

(7) Includes 96,750 shares subject to stock options exercisable within 60 days
    after June 30, 1999.

                                       60
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK

    The following description of our capital stock does not purport to be
complete and is subject in all respects to applicable Indiana law and to the
provisions of our Restated Articles of Incorporation and By-Laws, copies of
which have been filed as exhibits to the Registration Statement of which this
prospectus is a part.

    Our authorized capital stock consists of 100,000,000 shares of common stock,
$.01 par value per share, and 10,000,000 shares of preferred stock, without par
value. On June 30, 1999, after giving effect to this offering, and assuming that
the underwriters do not exercise their over-allotment options, there would have
been 13,370,121 shares of common stock issued and outstanding and no shares of
preferred stock issued and outstanding. An additional 2,256,954 shares of common
stock were issuable upon exercise of outstanding options granted as of June 30,
1999 under our stock option plans. See "Executive Compensation--Stock Option
Plans."

COMMON STOCK

    Each holder of common stock is entitled to one vote per share of record on
all matters to be voted upon by the stockholders. Holders do not have cumulative
voting rights in the election of directors or any other matter. Subject to the
preferential rights of the holders of any preferred stock that may at the time
be outstanding, each share of common stock will entitle the holder of that share
to an equal and ratable right to receive dividends when, if and as declared from
time to time by the board of directors out of legally available funds. We do not
anticipate paying cash dividends in the foreseeable future. See "Dividend
Policy."

    In the event of our liquidation, dissolution or winding up, the holders of
common stock will be entitled to share ratably in all assets remaining after
payments to creditors and after satisfaction of the liquidation preference, if
any, of the holders of any preferred stock that may at the time be outstanding.
Holders of common stock have no preemptive or redemption rights and will not be
subject to further calls or assessments by us. All of the shares of common stock
to be issued and sold in this offering will be, immediately upon consummation of
this offering, validly issued, fully paid and non-assessable.

PREFERRED STOCK

    The authorized preferred stock is available for issuance from time to time
at the discretion of the board of directors without stockholder approval. The
board of directors has the authority to prescribe for each series of preferred
stock it establishes the number of shares in that series, the number of votes,
if any, to which the shares in that series are entitled, the consideration for
the shares in that series, and the designations, powers, preferences and other
rights, qualifications, limitations or restrictions of the shares in that
series. Depending upon the rights prescribed for a series of preferred stock,
the issuance of preferred stock could have an adverse effect on the voting power
of the holders of common stock and could adversely affect holders of common
stock by delaying or preventing a change in control of us, making removal of our
present management more difficult or imposing restrictions upon the payment of
dividends and other distributions to the holders of common stock.

AUTHORIZED BUT UNISSUED SHARES

    Indiana law does not require stockholder approval for any issuance of
authorized shares. Authorized but unissued shares may be used for a variety of
corporate purposes, including future public or private offerings to raise
additional capital or to facilitate corporate acquisitions. One of the effects
of the existence of authorized but unissued shares may be to enable the board of
directors to issue shares to persons friendly to current management, which
issuance could render more difficult or discourage an attempt to obtain control
of us by means of a merger, tender offer, proxy contest or

                                       61
<PAGE>
otherwise, and thereby protect the continuity of current management and possibly
deprive the stockholders of opportunities to sell their shares of common stock
at prices higher than prevailing market prices.

CERTAIN PROVISIONS OF RESTATED ARTICLES OF INCORPORATION AND BY-LAWS

    Certain provisions of our Restated Articles of Incorporation and By-Laws may
delay or make more difficult unsolicited acquisitions or changes of control of
us. These provisions could have the effect of discouraging third parties from
making proposals involving an unsolicited acquisition or change in control of
us, although these proposals, if made, might be considered desirable by a
majority of our stockholders. These provisions may also have the effect of
making it more difficult for third parties to cause the replacement of the
current management without the concurrence of the board of directors. These
provisions include:

    - the division of the board of directors into three classes serving
      staggered terms of office of three years (see "Management--Executive
      Officers, Directors and Significant Employees");

    - the availability of authorized but unissued shares of stock for issuance
      from time to time at the discretion of the board of directors (see
      "--Authorized But Unissued Shares");

    - provisions allowing the removal of directors only for cause and only upon
      a 66 2/3% stockholder vote taken at a meeting called for that purpose;

    - permitting only the board of directors, the Chairman, the Chief Executive
      Officer or the President to call a special meeting of stockholders; and

    - requirements for advance notice for raising business or making nominations
      at stockholders' meetings.

    Our By-Laws establish an advance notice procedure with regard to business to
be brought before an annual or special meeting of stockholders and with regard
to the nomination of candidates for election as directors, other than by or at
the direction of the board of directors. Although our By-Laws do not give the
board of directors any power to approve or disapprove stockholder nominations
for the election of directors or proposals for action, they may have the effect
of precluding a contest for the election of directors or the consideration of
stockholder proposals if the established procedures are not followed, and of
discouraging or deterring a third party from conducting a solicitation of
proxies to elect its own slate of directors or to approve its proposal without
regard to whether consideration of those nominees or proposals might be harmful
or beneficial to us and our stockholders.

CERTAIN PROVISIONS OF INDIANA LAW

    The Indiana Business Corporation Law (the "IBCL") applies to us as an
Indiana corporation. Under specified circumstances, the following provisions of
the IBCL may delay, prevent or make more difficult unsolicited acquisition or
changes of control of us. These provisions also may have the effect of
preventing changes in our management. It is possible that these provisions could
make it more difficult to accomplish transactions which stockholders may
otherwise deem to be in their best interests.

    CONTROL SHARE ACQUISITIONS.  Under Sections 23-1-42-1 to 23-1-42-11 of the
IBCL, an "acquiring person" who makes a "control share acquisition" in an
"issuing public corporation" may not exercise voting rights on any "control
shares" unless these voting rights are conferred by a majority vote of the
disinterested stockholders of the issuing corporation at a special meeting of
those stockholders held upon the request and at the expense of the acquiring
person. If control shares acquired in a control share acquisition are accorded
full voting rights and the acquiring person acquires control shares with a
majority or more of all voting power, all stockholders of the issuing
corporation have dissenters' rights to receive the fair value of their shares.

                                       62
<PAGE>
    Under the IBCL, "control shares" means shares acquired by a person that,
when added to all other shares of the issuing public corporation owned by that
person or in respect to which that person may exercise or direct the exercise of
voting power, would otherwise entitle that person to exercise voting power of
the issuing public corporation in the election of directors within any of the
following ranges:

    - one-fifth or more but less than one-third;

    - one-third or more but less than a majority; or

    - a majority or more.

    "Control share acquisition" means, subject to specified exceptions, the
acquisition, directly or indirectly, by any person of ownership of, or the power
to direct the exercise of voting power with respect to, issued and outstanding
control shares. Shares acquired within 90 days or under a plan to make a control
share acquisition are considered to have been acquired in the same acquisition.
"Issuing public corporation" means a corporation which is organized in Indiana,
has 100 or more stockholders, its principal place of business, its principal
office or substantial assets within Indiana and either:

    - more than 10% of its stockholders resident in Indiana;

    - more than 10% of its shares owned by Indiana residents; or

    - 10,000 stockholders resident in Indiana.

    The above provisions do not apply if, before a control share acquisition is
made, the corporation's articles of incorporation or by-laws, including a board
adopted by-law, provide that they do not apply. Our Restated Articles of
Incorporation and By-Laws do not exclude us from the restrictions imposed by the
above provisions.

    CERTAIN BUSINESS COMBINATIONS.  Sections 23-1-43-1 to 23-1-43-23 of the IBCL
restrict the ability of a "resident domestic corporation" to engage in any
combinations with an "interested stockholder" for five years after the
interested stockholder's date of acquiring shares unless the combination or the
purchase of shares by the interested stockholder on the interested stockholder's
date of acquiring shares is approved by the board of directors of the resident
domestic corporation before that date. If the combination was not previously
approved, the interested stockholder may effect a combination after the
five-year period only if that stockholder receives approval from a majority of
the disinterested shares or the offer meets specified fair price criteria. For
purposes of the above provisions, "resident domestic corporation" means an
Indiana corporation that has 100 or more stockholders. "Interested stockholder"
means any person, other than the resident domestic corporation or its
subsidiaries, who is (1) the beneficial owner, directly or indirectly, of 10% or
more of the voting power of the outstanding voting shares of the resident
domestic corporation or (2) an affiliate or associate of the resident domestic
corporation and at any time within the five-year period immediately before the
date in question was the beneficial owner of 10% or more of the voting power of
the then outstanding shares of the resident domestic corporation. The above
provisions do not apply to corporations that so elect in an amendment to their
articles of incorporation approved by a majority of the disinterested shares.
That amendment, however, would not become effective until 18 months after its
passage and would apply only to stock acquisitions occurring after its effective
date. Our Restated Articles of Incorporation do not exclude us from the
restrictions imposed by the above provisions.

    DIRECTORS' DUTIES AND LIABILITY.  Under Section 23-1-35-1 of the IBCL,
directors are required to discharge their duties:

    - in good faith;

    - with the care an ordinarily prudent person in a like position would
      exercise under similar circumstances; and

                                       63
<PAGE>
    - in a manner the directors reasonably believe to be in the best interests
      of the corporation.

However, the IBCL also provides that a director is not liable for any action
taken as a director, or any failure to act, unless the director has breached or
failed to perform the duties of the director's office and the action or failure
to act constitutes willful misconduct or recklessness. The exoneration from
liability under the IBCL does not affect the liability of directors for
violations of the federal securities laws.

    Section 23-1-35-1 of the IBCL also provides that a board of directors, in
discharging its duties, may consider, in its discretion, both the long-term and
short-term best interests of the corporation, taking into account, and weighing
as the directors deem appropriate, the effects of an action on the corporation's
stockholders, employees, suppliers and customers and the communities in which
offices or other facilities of the corporation are located and any other factors
the directors consider pertinent. If a determination is made with the approval
of a majority of the disinterested directors of the board, that determination is
conclusively presumed to be valid unless it can be demonstrated that the
determination was not made in good faith after reasonable investigation. Once
the board has determined that the proposed action is not in the best interests
of the corporation, it has no duty to remove any barriers to the success of the
action, including a rights plan. Section 23-1-35-1 specifically provides that
specified judicial decisions in Delaware and other jurisdictions, which might be
looked upon for guidance in interpreting Indiana law, including decisions that
propose a higher or different degree of scrutiny in response to a proposed
acquisition of the corporation, are inconsistent with the proper application of
that section.

TRANSFER AGENT AND REGISTRAR

    The transfer agent and registrar for the common stock will be Norwest Bank
Minnesota, National Association.

                                       64
<PAGE>
                        SHARES ELIGIBLE FOR FUTURE SALE

    Prior to this offering, there has been no market for our common stock and we
cannot make any predictions as to the effect, if any, that market sales of
shares or the availability of shares of our common stock for future sale will
have on the market price of the common stock from time to time. Sales of
substantial amounts of our common stock in the public market following this
offering could adversely affect the market price of our common stock and our
ability to raise additional capital.
    Giving effect to completion of this offering, as of June 30, 1999, we would
have had 13,370,121 shares of common stock outstanding assuming that the
underwriters do not exercise their over-allotment options and that no
participants exercise their outstanding options under our stock option plans.
The shares of our common stock sold in this offering will be freely tradeable
without restriction or further registration under the Securities Act except for
any of those shares that are beneficially owned at any time by our affiliates,
as defined in Rule 144 under the Securities Act, which sales will be subject to
the timing, volume and manner of sale limitations of Rule 144. The remaining
10,700,121 shares of our common stock outstanding after this offering held by
those who were stockholders prior to this offering will be restricted
securities, as defined in Rule 144. These restricted securities may be sold in
the public market if they are registered under the Securities Act or they are
exempted by an exemption from registration, such as the exemptions provided by
Rule 144. As a result of contractual restrictions, the 180-day lock-up described
below and the provisions of Rule 144, additional shares will be available for
sale in the public market as follows:

    - 271,146 restricted securities will be eligible for sale 90 days after the
      date of this prospectus; and

    - 10,428,975 restricted securities will be eligible for sale upon the
      expiration of the lock-up agreements described below 180 days after the
      date of this prospectus.

    In general, under Rule 144 as currently in effect, a person, or persons
whose shares are aggregated, who has beneficially owned restricted shares for at
least one year will be entitled to sell, within any three-month period, a number
of shares that does not exceed the greater of 1% of the then outstanding shares
of our common stock, or the average weekly trading volume of our common stock
during the four calendar weeks preceding such sale. Sales under Rule 144 are
also subject to certain provisions regarding the manner of sale, notice
requirements and the availability of current public information about us. If two
years have elapsed since the date of acquisition of restricted shares of our
common stock from us or any of our affiliates and the holder is not deemed to
have been an affiliate of ours for at least three months prior to a proposed
transaction, such person would be entitled to sell such shares under Rule 144
without regard to the limitations described above.

    Through June 30, 1999, we have granted options to purchase 2,256,954 shares
of common stock to specified persons pursuant to our stock option plans, and an
additional 3,676,875 shares of common stock are available for grant of future
options thereunder. See "Executive Compensation--Stock Option Plans." We intend
to file a registration statement on Form S-8 as soon as practicable after the
date of this prospectus to register the shares of common stock that are issuable
upon the exercise of stock options either outstanding or available for grant
pursuant to our stock option plans. Following effectiveness, shares covered by
the registration statement on Form S-8 will be eligible for sale in the public
markets, subject to Rule 144 limitations applicable to affiliates as well as to
the limitations on sale and vesting described above.

    We, our directors and executive officers, one other significant employee and
Dialogic Investment Corporation have agreed for a period of 180 days after the
date of this prospectus not to:

    - directly or indirectly offer, pledge, sell, contract to sell, sell any
      option or contract to purchase, purchase any option or contract to sell,
      grant any option, right or warrant to purchase or otherwise dispose of or
      transfer any shares of our common stock or any securities convertible

                                       65
<PAGE>
      into or exchangeable or exercisable for our common stock or file any
      registration statement under the Securities Act with respect to any of the
      foregoing; or

    - enter into any swap or any other agreement or any transaction that
      transfers, in whole or in part, directly or indirectly, the economic
      consequence of ownership of our common stock,

whether any such swap or transaction described in the first or second bullet
point above is to be settled by delivery of common stock or other securities, in
cash or otherwise, without the prior written consent of Merrill Lynch, Pierce,
Fenner & Smith Incorporated on behalf of the underwriters. However, these
restrictions will not apply to:

    - this offering;

    - the issuance by us of any shares of our common stock upon the exercise of
      an outstanding option or the conversion of an outstanding security; or

    - the issuance by us of any shares of our common stock or the grant by us of
      options to purchase our common stock pursuant to our existing stock option
      plans.

                                       66
<PAGE>
                                  UNDERWRITING

    Merrill Lynch, Pierce, Fenner & Smith Incorporated, Hambrecht & Quist LLC
and U.S. Bancorp Piper Jaffray Inc. are acting as representatives of each of the
underwriters named below. Subject to the terms and conditions set forth in the
Underwriting Agreement among us, our principal stockholder, the selling
stockholder and the underwriters, we have agreed to sell to the underwriters,
and each of the underwriters severally has agreed to purchase from us, the
number of shares of our common stock set forth opposite its name below.

<TABLE>
<CAPTION>
             UNDERWRITER                                                                         NUMBER OF SHARES
                                                                                                 -----------------
<S>                                                                                              <C>
Merrill Lynch, Pierce, Fenner & Smith
           Incorporated........................................................................         825,000
Hambrecht & Quist LLC..........................................................................         412,500
U.S. Bancorp Piper Jaffray Inc.................................................................         412,500
BancBoston Robertson Stephens Inc..............................................................         100,000
Banc of America Securities LLC.................................................................         100,000
Deutsche Bank Securities Inc...................................................................         100,000
Lehman Brothers Inc............................................................................         100,000
J.P. Morgan Securities Inc.....................................................................         100,000
SG Cowen Securities Corporation................................................................         100,000
SoundView Technology Group, Inc................................................................         100,000
Dain Rauscher Wessels, a division of Dain Rauscher Incorporated................................          40,000
FAC/Equities...................................................................................          40,000
First Analysis Securities Corporation..........................................................          40,000
Gerard Klauer Mattison & Co., Inc..............................................................          40,000
John G. Kinnard and Company, Incorporated......................................................          40,000
McDonald Investments Inc.......................................................................          40,000
NatCity Investments, Inc.......................................................................          40,000
H. C. Wainwright & Co., Inc....................................................................          40,000
                                                                                                 -----------------
          Total................................................................................       2,670,000
                                                                                                 -----------------
                                                                                                 -----------------
</TABLE>

    In the Underwriting Agreement, the several underwriters have agreed, subject
to the terms and conditions set forth therein, to purchase all of the shares of
our common stock being sold pursuant to the Underwriting Agreement if any shares
of our common stock are purchased. Under certain circumstances, under the terms
of the Underwriting Agreement, the commitments of the non-defaulting
underwriters may be increased or the Underwriting Agreement may be terminated.

    The representatives have advised us that they propose initially to offer the
shares of our common stock to the public at the initial public offering price
set forth on the cover page of this prospectus, and to certain dealers at such
price less a concession not in excess of $.54 per share of common stock. The
underwriters may allow, and such dealers may reallow, a discount not in excess
of $.10 per share of common stock on sales to certain other dealers. After the
initial public offering, the public offering price, concession and discount may
be changed.
    We have granted the underwriters a 30-day option to purchase up to an
aggregate of 330,500 additional shares of our common stock, and Mr. Gibbs, the
selling stockholder, has granted to the underwriters a 30-day option to purchase
up to an aggregate of 70,000 shares of our common stock owned by him, at the
initial public offering price set forth on the cover of this prospectus, less
the underwriting discount. The underwriters may exercise these options to cover
over-allotments, if any, made on the sale of our common stock offered by this
prospectus. The underwriters must first exercise the option to purchase the
shares offered by the selling stockholder before they can exercise the option to
purchase our shares. To the extent that the underwriters exercise either of
these options, each

                                       67
<PAGE>
underwriter will be obligated, subject to certain conditions, to purchase a
number of additional shares of our common stock proportionate to that
underwriter's initial amount reflected in the table above.

    The following table shows the per share and total underwriting discounts to
be paid by us and the selling stockholder to the underwriters. This information
is presented assuming either no exercise or full exercise by the underwriters of
their over-allotment options.

<TABLE>
<CAPTION>
                                                                               PER        WITHOUT         WITH
                                                                              SHARE       OPTIONS        OPTIONS
                                                                            ---------  -------------  -------------
<S>                                                                         <C>        <C>            <C>
Public offering price.....................................................  $   13.00  $  34,710,000  $  39,916,500
Underwriting discount.....................................................       $.91     $2,429,700     $2,794,155
Proceeds, before expenses, to us..........................................  $   12.09  $  32,280,300  $  36,276,045
Proceeds to the selling stockholder.......................................  $   12.09             $0       $846,300
</TABLE>

    We will not receive any of the proceeds from the sale of any shares sold by
the selling stockholder. The expenses of this offering are estimated at $750,000
and are all payable by us.

    The shares of common stock are being offered by the several underwriters,
subject to prior sale, when as and if issued to and accepted by them, subject to
approval of certain legal matters by counsel for the underwriters and certain
other conditions. The underwriters reserve the right to withdraw, cancel or
modify such offer and to reject orders in whole or in part.

    At our request, the underwriters have reserved up to 7% of the shares of our
common stock offered by this prospectus for sale, at the initial public offering
price, to some of our employees, executive officers, directors and resellers and
to some individuals designated by them. The number of shares of our common stock
available for sale to the general public in this offering will be reduced to the
extent such persons purchase such reserved shares. Any reserved shares which are
not so purchased will be offered by the underwriters to the general public on
the same basis as the other shares offered by this prospectus.

    We, our directors and executive officers, one other significant employee and
Dialogic Investment Corporation have agreed for a period of 180 days after the
date of this prospectus not to:

    - directly or indirectly offer, pledge, sell, contract to sell, sell any
      option or contract to purchase, purchase any option or contract to sell,
      grant any option, right or warrant to purchase or otherwise dispose of or
      transfer any shares of our common stock or any securities convertible into
      or exchangeable or exercisable for our common stock or file any
      registration statement under the Securities Act with respect to any of the
      foregoing; or

    - enter into any swap or any other agreement or any transaction that
      transfers, in whole or in part, directly or indirectly, the economic
      consequence of ownership of our common stock,

whether any such swap or transaction described in the first or second bullet
point above is to be settled by delivery of common stock or other securities, in
cash or otherwise, without the prior written consent of Merrill Lynch on behalf
of the underwriters. However, these restrictions will not apply to:

    - this offering;

    - the issuance by us of any shares of our common stock upon the exercise of
      an outstanding option or the conversion of an outstanding security; or

    - the issuance by us of any shares of our common stock or the grant by us of
      options to purchase our common stock pursuant to our existing stock option
      plans. See "Shares Eligible for Future Sale."

    Prior to this offering, there has been no market for our common stock. The
initial public offering price was determined through negotiations among us and
the representatives. Among the factors

                                       68
<PAGE>
considered in determining the initial public offering price, in addition to
prevailing market conditions, were the trading multiples of publicly traded
companies that the representatives believe to be comparable to us, certain of
our financial information, the history of, and the prospects for, us and the
industry in which we compete, an assessment of our management, our past and
present operations, the prospects for, and timing of, our future revenues, the
present state of our development, the percentage interest of our company being
sold as compared to the valuation for the entire company and the above factors
in relation to market values and various valuation measures of other companies
engaged in activities similar to ours. We cannot assure you that an active
trading market will develop for our common stock or that our common stock will
trade in the public market subsequent to this offering at or above the initial
public offering price.
    Our common stock has been approved for quotation on the Nasdaq National
Market under the symbol "ININ."

    The underwriters do not intend to confirm sales of our common stock to any
accounts over which they exercise discretionary authority.

    We, our principal stockholder and the selling stockholder have agreed to
indemnify the underwriters against certain liabilities, including certain
liabilities under the Securities Act, or to contribute to payments the
underwriters may be required to make in respect of those liabilities.

    Until the distribution of our common stock is completed, SEC rules may limit
the ability of the underwriters and certain selling group members to bid for and
purchase our common stock. As an exception to these rules, the representatives
are permitted to engage in certain transactions that stabilize the price of our
common stock. Such transactions consist of bids or purchases for the purpose of
pegging, fixing, or maintaining the price of our common stock. If commenced,
such transactions may be discontinued at any time without notice.

    If the underwriters create a short position in our common stock in
connection with this offering, that is, if they sell more shares of common stock
than are set forth on the cover pages of this prospectus, the representatives
may reduce that short position by purchasing common stock in the open market.
The representatives may also elect to reduce any short position by exercising
all or part of the over-allotment option described above.

    The representatives may also impose a penalty bid on certain underwriters
and selling group members. This means that if the representatives purchase
shares of our common stock in the open market to reduce the underwriters' short
position or to stabilize the price of our common stock, they may reclaim the
amount of the selling concession from the underwriters and selling group members
who sold those shares as part of this offering.

    In general, purchases of a security for the purpose of stabilization or to
reduce a short position could cause the price of the security to be higher than
it might be in the absence of such purchases. The imposition of a penalty bid
might also have an effect on the price of our common stock to the extent that it
discourages resales of our common stock.

    Neither we nor any of the underwriters makes any representation or
prediction as to the direction or magnitude of any effect that the transactions
described above may have on the price of our common stock. In addition, neither
we nor any of the underwriters makes any representation that the representatives
will engage in such transactions or that such transactions, once commenced, will
not be discontinued without notice.

                                       69
<PAGE>
                                 LEGAL MATTERS

    The validity of the common stock offered by this prospectus will be passed
upon by Baker & Daniels, Indianapolis, Indiana. Certain legal matters in
connection with this offering will be passed upon for the underwriters by Mayer,
Brown & Platt, Chicago, Illinois.

                                    EXPERTS

    Ernst & Young LLP, independent auditors, have audited our consolidated
financial statements and schedule at December 31, 1998 and 1997, and for each of
the three years in the period ended December 31, 1998, as set forth in their
reports. We have included our financial statements and schedule in this
prospectus and elsewhere in the registration statement in reliance on Ernst &
Young LLP's report, given on their authority as experts in accounting and
auditing.

                             ADDITIONAL INFORMATION

    We have filed with the SEC a Registration Statement on Form S-1 under the
Securities Act with respect to our common stock offered hereby. This prospectus
is a part of that Registration Statement. This prospectus contains all material
information with respect to the matters discussed in it, but it does not contain
all of the information set forth in the Registration Statement and the exhibits
and schedule to the Registration Statement. Certain parts of the Registration
Statement are omitted as allowed by the rules and regulations of the SEC. We
refer to the Registration Statement and to the exhibits and schedule to the
Registration Statement for further information with respect to us and our common
stock being offered hereby.

    Copies of the Registration Statement and the exhibits and schedule to the
Registration Statement are on file at the offices of the SEC and copies may be
obtained upon payment of the prescribed fee or may be examined without charge at
the public reference facilities maintained by the SEC at its principal office
located at 450 Fifth Street, N.W., Washington, D.C. 20549, and at the SEC's
regional offices located at 7 World Trade Center, Suite 1300, New York, New York
10048 and 500 West Madison Street, Suite 1400, Chicago, Illinois 60661. The SEC
also maintains a World Wide Web site on the Internet at http://www.sec.gov which
contains reports, proxy and information statements and other information
regarding companies that file electronically with the SEC. Those reports, proxy
and information statements and other information also can be inspected at
Nasdaq's office at 1735 K Street, N.W., Washington, D.C. 20006.

                                       70
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

<TABLE>
<CAPTION>
                                                                                                                PAGE
                                                                                                                -----
<S>                                                                                                          <C>
Report of Independent Auditors.............................................................................         F-2

Consolidated Balance Sheets................................................................................         F-3

Consolidated Statements of Operations......................................................................         F-4

Consolidated Statements of Shareholders' Deficit...........................................................         F-5

Consolidated Statements of Cash Flows......................................................................         F-6

Notes to Consolidated Financial Statements.................................................................         F-7
</TABLE>

                                      F-1
<PAGE>
                         REPORT OF INDEPENDENT AUDITORS

The Board of Directors
Interactive Intelligence, Inc.

    We have audited the accompanying consolidated balance sheets of Interactive
Intelligence, Inc. as of December 31, 1998 and 1997 and the related consolidated
statements of operations, shareholders' deficit and cash flows for each of the
three years in the period ended December 31, 1998. These financial statements
are the responsibility of the Company's management. Our responsibility is to
express an opinion on these financial statements based on our audits.

    We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

    In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Interactive Intelligence,
Inc. at December 31, 1998 and 1997 and the results of its operations and its
cash flows for each of the three years in the period ended December 31, 1998 in
conformity with generally accepted accounting principles.

                                          /s/ ERNST & YOUNG LLP

Indianapolis, IN

February 3, 1999, except as to the first paragraph of Note 5,
as to which the date is April 16, 1999 and Note 12, as to
which the date is July 12, 1999

                                      F-2
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.
                          CONSOLIDATED BALANCE SHEETS
                      (IN THOUSANDS, EXCEPT SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                                    DECEMBER 31,
                                                                                ---------------------
                                                                                  1997        1998
                                                                                ---------  ----------   JUNE 30,
                                                                                                          1999
                                                                                                       -----------
                                                                                                       (UNAUDITED)
<S>                                                                             <C>        <C>         <C>
                                                      ASSETS
Current assets:
  Cash and cash equivalents...................................................  $     390  $    2,021   $      87
  Accounts receivable, net of allowance for doubtful accounts of $148 in 1997,
    $272 in 1998, and $345 in 1999............................................      1,353       3,269       3,592
  Prepaid expenses............................................................        148         269         322
  Other current assets........................................................         20          75         104
                                                                                ---------  ----------  -----------
Total current assets..........................................................      1,911       5,634       4,105

Property and equipment, net...................................................      1,197       2,440       3,509

Other assets, net.............................................................         33         165         184
                                                                                ---------  ----------  -----------
Total assets..................................................................  $   3,141  $    8,239   $   7,798
                                                                                ---------  ----------  -----------
                                                                                ---------  ----------  -----------

                                      LIABILITIES AND SHAREHOLDERS' DEFICIT
Current liabilities:
  Accounts payable and accrued liabilities....................................  $     785  $    1,597   $   1,819
  Accrued compensation and related expenses...................................        157         265         736
  Lines of credit.............................................................      1,500          --       1,055
  Deferred revenue............................................................        903       1,500       3,076
  Current portion of capital lease obligations................................        141         541         586
                                                                                ---------  ----------  -----------
Total current liabilities.....................................................      3,486       3,903       7,272

Accounts payable and deferred compensation - shareholder......................        487         584         550
Notes payable and accrued interest - shareholder..............................      5,084       7,969       7,346
Capital lease obligations, net of current portion.............................        301         937         627

Shareholders' deficit:
Preferred stock, no par value; 10,000,000 authorized; no shares issued and
  outstanding.................................................................         --          --          --
Common stock, $0.01 par value; 100,000,000 authorized; 7,741,500 issued and
  outstanding at December 31, 1997, 10,075,891 issued and outstanding at
  December 31, 1998, 10,700,121 issued and outstanding at June 30, 1999.......         77         101         107
Additional paid-in-capital....................................................        955       9,386      10,739
Accumulated deficit...........................................................     (7,249)    (14,641)    (18,843)
                                                                                ---------  ----------  -----------
Total shareholders' deficit...................................................     (6,217)     (5,154)     (7,997)
                                                                                ---------  ----------  -----------
Total liabilities and shareholders' deficit...................................  $   3,141  $    8,239   $   7,798
                                                                                ---------  ----------  -----------
                                                                                ---------  ----------  -----------
</TABLE>

See accompanying notes.

                                      F-3
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.
                     CONSOLIDATED STATEMENTS OF OPERATIONS
                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)

<TABLE>
<CAPTION>
                                                                  YEAR ENDED
                                                                 DECEMBER 31,
                                                        -------------------------------
                                                          1996       1997       1998
                                                        ---------  ---------  ---------      SIX MONTHS ENDED
                                                                                                 JUNE 30,
                                                                                         ------------------------
                                                                                            1998         1999
                                                                                         -----------  -----------
                                                                                         (UNAUDITED)  (UNAUDITED)
<S>                                                     <C>        <C>        <C>        <C>          <C>
Revenues:
  Software............................................  $      --  $   1,265  $   7,662   $   2,980    $   5,482
  Services............................................         --        325      1,349         407        1,826
                                                        ---------  ---------  ---------  -----------  -----------
Total revenues........................................         --      1,590      9,011       3,387        7,308
                                                        ---------  ---------  ---------  -----------  -----------

Costs and expenses:
  Costs of software...................................         --         38         59          24           60
  Costs of services...................................         --      1,258      3,381       1,387        2,360
  Sales and marketing.................................        157      2,519      6,623       2,715        4,553
  Research and development............................        987      2,118      4,065       1,837        3,004
  General and administrative..........................        192        742      1,407         590        1,135
                                                        ---------  ---------  ---------  -----------  -----------
Total costs and expenses..............................      1,336      6,675     15,535       6,553       11,112
                                                        ---------  ---------  ---------  -----------  -----------
Operating loss........................................     (1,336)    (5,085)    (6,524)     (3,166)      (3,804)

Interest expense, net.................................         43        361        868         428          398
                                                        ---------  ---------  ---------  -----------  -----------
Loss before income taxes..............................     (1,379)    (5,446)    (7,392)     (3,594)      (4,202)

Income taxes..........................................         --         --         --          --           --
                                                        ---------  ---------  ---------  -----------  -----------

Net loss..............................................  $  (1,379) $  (5,446) $  (7,392)  $  (3,594)   $  (4,202)
                                                        ---------  ---------  ---------  -----------  -----------
                                                        ---------  ---------  ---------  -----------  -----------

Net loss per share:
Basic and diluted.....................................  $   (0.33) $   (0.71) $   (0.84)  $   (0.44)   $   (0.40)
                                                        ---------  ---------  ---------  -----------  -----------
                                                        ---------  ---------  ---------  -----------  -----------

Shares used to compute net loss per share:
Basic and diluted.....................................      4,216      7,642      8,816       8,203       10,538
</TABLE>

See accompanying notes.

                                      F-4
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.
                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' DEFICIT
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                 COMMON STOCK       ADDITIONAL
                                                            ----------------------    PAID-IN    ACCUMULATED
                                                             SHARES      AMOUNT       CAPITAL      DEFICIT       TOTAL
                                                            ---------  -----------  -----------  ------------  ---------
<S>                                                         <C>        <C>          <C>          <C>           <C>
Balances, January 1, 1996.................................      3,982   $      40    $     491    $     (424)  $     107

  Issuances of common stock...............................      3,518          35          434            --         469
  Net loss................................................         --          --           --        (1,379)     (1,379)
                                                            ---------       -----   -----------  ------------  ---------
Balances, December 31, 1996...............................      7,500          75          925        (1,803)       (803)

  Exercise of stock options...............................        242           2           30            --          32
  Net loss................................................         --          --           --        (5,446)     (5,446)
                                                            ---------       -----   -----------  ------------  ---------
Balances, December 31, 1997...............................      7,742          77          955        (7,249)     (6,217)

  Conversion of shareholder debt to equity................      1,000          10        2,990            --       3,000
  Issuances of common stock...............................        711           7        5,326            --       5,333
  Repurchases of common stock.............................         (3)         --          (12)           --         (12)
  Exercise of stock options...............................        626           7          127            --         134
  Net loss................................................         --          --           --        (7,392)     (7,392)
                                                            ---------       -----   -----------  ------------  ---------
Balances, December 31, 1998...............................     10,076         101        9,386       (14,641)     (5,154)

  Conversion of shareholder obligations to equity.........        131           1        1,083            --       1,084
  Issuances of common stock...............................         15          --          120            --         120
  Repurchases of common stock.............................         (1)         --          (10)           --         (10)
  Exercise of stock options...............................        479           5          141            --         146
  Amortization of deferred stock based compensation.......         --          --           19            --          19
  Net loss................................................         --          --           --        (4,202)     (4,202)
                                                            ---------       -----   -----------  ------------  ---------
Balances, June 30, 1999 (unaudited).......................     10,700   $     107    $  10,739    $  (18,843)  $  (7,997)
                                                            ---------       -----   -----------  ------------  ---------
                                                            ---------       -----   -----------  ------------  ---------
</TABLE>

See accompanying notes.

                                      F-5
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                   YEAR ENDED
                                                                  DECEMBER 31,                SIX MONTHS ENDED
                                                         -------------------------------          JUNE 30,
                                                           1996       1997       1998     ------------------------
                                                         ---------  ---------  ---------     1998         1999
                                                                                          -----------  -----------
                                                                                          (UNAUDITED)  (UNAUDITED)
<S>                                                      <C>        <C>        <C>        <C>          <C>
OPERATING ACTIVITIES
Net loss...............................................  $  (1,379) $  (5,446) $  (7,392)  $  (3,594)   $  (4,202)
Adjustments to reconcile net loss to net cash used by
  operating activities:
  Depreciation.........................................         84        273        774         328          661
  Amortization of deferred stock based compensation....         --         --         --          --           19
  Changes in operating assets and liabilities:
    Accounts receivable................................        (37)    (1,316)    (1,916)     (1,639)        (323)
    Prepaid expenses...................................        (42)      (106)      (121)         (1)         (53)
    Other current assets...............................         --        (18)       (55)        (31)         (29)
    Accounts payable and accrued liabilities...........         59        674        812         318          222
    Accrued compensation and related expenses..........         75        120        108         201          471
    Deferred revenue...................................         --        903        597         338        1,576
    Accounts payable and deferred compensation -
      shareholder......................................         50        425         97          50          (34)
                                                         ---------  ---------  ---------  -----------  -----------
Net cash used by operating activities..................     (1,190)    (4,491)    (7,096)     (4,030)      (1,692)

INVESTING ACTIVITIES
Purchases of property and equipment, net...............       (330)      (657)      (697)        (91)      (1,730)
Change in other assets.................................         (8)       (23)      (132)        (24)         (19)
                                                         ---------  ---------  ---------  -----------  -----------
Net cash used by investing activities..................       (338)      (680)      (829)       (115)      (1,749)

FINANCING ACTIVITIES
Borrowings under lines of credit.......................        500      1,000         --          51        1,055
Repayments of lines of credit..........................         --         --     (1,500)        (51)          --
Principal payments on capital lease obligations........         --        (47)      (284)       (104)        (265)
Borrowings under notes payable and accrued interest -
  shareholder..........................................        531      4,553      5,885       3,877          461
Proceeds from issuances of common stock................        469         --      5,333          --          120
Repurchases of common stock............................         --         --        (12)         --          (10)
Proceeds from stock options exercised..................         --         32        134          66          146
                                                         ---------  ---------  ---------  -----------  -----------
Net cash provided by financing activities..............      1,500      5,538      9,556       3,839        1,507
                                                         ---------  ---------  ---------  -----------  -----------
Net increase (decrease) in cash and cash equivalents...        (28)       367      1,631        (306)      (1,934)

Cash and cash equivalents, beginning of period.........         51         23        390         390        2,021
                                                         ---------  ---------  ---------  -----------  -----------

Cash and cash equivalents, end of period...............  $      23  $     390  $   2,021   $      84    $      87
                                                         ---------  ---------  ---------  -----------  -----------
                                                         ---------  ---------  ---------  -----------  -----------
Supplemental disclosure of non-cash investing and
  financing activities:
  Acquisition of property and equipment with capital
    lease..............................................  $      --  $     488  $   1,320   $     822    $      --
</TABLE>

See accompanying notes.

                                      F-6
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

1. THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES

THE COMPANY

    Interactive Intelligence, Inc. ("I3" or "the Company") develops, markets,
and supports enterprise software that allows its customers to automate virtually
every aspect of their business communications. The Company's flagship product,
Enterprise Interaction Center (EIC), is a complete communications solution
providing PBX (private branch exchange), ACD (automated call distributor), IVR
(interactive voice response), unified messaging, and Internet functionality on a
single Windows NT Server. The Company currently derives substantially all of its
revenues from licenses of the Enterprise Interaction Center product and related
services.

    Principal operations of the Company commenced during 1997. In 1998, the
Company established a wholly-owned subsidiary in France and a branch office in
Japan. The Company's products are marketed primarily in North America, Western
Europe, South Africa and the Asia/Pacific region.

PRINCIPLES OF CONSOLIDATION

    The consolidated financial statements include the accounts of the Company
and its wholly owned subsidiary after elimination of all significant
intercompany accounts and transactions.

REVENUE RECOGNITION

    The Company generates software revenues from licensing the rights to use its
software products and also generates service revenues primarily from ongoing
maintenance (post-contract technical support and product upgrades), educational
services, and professional services performed for resellers and end-user
customers.

    Revenue from software license agreements is recognized upon shipment of the
software if:

    - persuasive evidence of an arrangement exists;

    - sufficient vendor-specific objective evidence exists to support allocating
      the total fee to all elements of the arrangement;

    - the fee is fixed or determinable; and

    - collection is probable.

Shipment is further defined in certain contracts as delivery of the product
master or first copy for non-cancelable product licensing arrangements under
which the reseller has certain software distribution rights. For licensing
arrangements placed through a reseller, software revenues are generally
recognized upon placement of a reseller's binding order, as delivery has
occurred through the reseller's possession of a product master and there are no
further delivery obligations on behalf of the Company.

    Revenue from ongoing end-user customer maintenance is recognized ratably
over the post-contract support term, which is typically twelve months. Revenue
from educational services and professional services is recognized when the
services are performed.

                                      F-7
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

1. THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
USE OF ESTIMATES

    The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the amounts reported in the financial statements and
accompanying notes. Despite management's best effort to establish good faith
estimates and assumptions, actual results could differ from these estimates.

CASH AND CASH EQUIVALENTS

    The Company considers all highly liquid investments with a maturity from
date of purchase of three months or less to be cash equivalents. Cash and cash
equivalents consist primarily of cash on deposit with banks and high quality
money market instruments.

FINANCIAL INSTRUMENTS

    The fair value of financial instruments, including cash and cash
equivalents, accounts receivable, and debt approximate the carrying values.

PROPERTY AND EQUIPMENT

    Property and equipment are stated at cost. Leasehold improvements are
amortized using the straight-line method over the lesser of the term of the
related lease or the estimated useful life. Depreciation, which includes
amortization on capital leases, is calculated using the straight-line method
over the estimated useful lives of the assets.

RESEARCH AND DEVELOPMENT

    Research and development expenditures are generally charged to operations as
incurred. Statement of Financial Accounting Standards No. 86, ACCOUNTING FOR THE
COSTS OF COMPUTER SOFTWARE TO BE SOLD, LEASED OR OTHERWISE MARKETED, requires
capitalization of certain software development costs subsequent to the
establishment of technological feasibility. Based on the Company's product
development process, technological feasibility is established upon completion of
a working model. Costs incurred by the Company between completion of the working
model and the point at which the product is ready for general release have been
insignificant. Through June 30, 1999, all research and development costs have
been expensed.

STOCK OPTIONS

    In accordance with Statement of Financial Accounting Standards No. 123,
ACCOUNTING FOR STOCK-BASED COMPENSATION (SFAS 123), the Company uses the
intrinsic value method to account for stock options, consistent with the
existing rules established by Accounting Principles Board No. 25, ACCOUNTING FOR
STOCK ISSUED TO EMPLOYEES.

                                      F-8
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

1. THE COMPANY AND SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
LOSS PER SHARE

    Basic loss per share is calculated based on the weighted-average number of
outstanding common shares in accordance with Statement of Financial Accounting
Standard No. 128, EARNINGS PER SHARE. Diluted loss per share is calculated based
on the weighted-average number of outstanding common shares plus the effect of
dilutive potential common shares. The Company's calculation of diluted net loss
per share excludes potential common shares as the effect would be antidilutive.
Potential common shares are composed of shares of common stock issuable upon the
exercise of stock options.

UNAUDITED INTERIM FINANCIAL STATEMENTS

    The accompanying unaudited financial statements as of June 30, 1999, and for
the six months ended June 30, 1998 and 1999, have been prepared in accordance
with generally accepted accounting principles for interim financial information
and with the instructions to Article 10 of Regulation S-X of the Securities
Exchange Act of 1934. Accordingly, they do not include all of the information
and footnotes required by generally accepted accounting principles for complete
financial statements.

    In the opinion of the Company, all adjustments considered necessary to
present fairly the consolidated financial position as of June 30, 1999 and the
consolidated statements of operations, shareholders' deficit and cash flows for
the six month periods ended June 30, 1998 and 1999 have been included.

RECENTLY ISSUED ACCOUNTING STANDARDS

    Effective January 1, 1998, the Company adopted Statement of Financial
Accounting Standards No. 130, REPORTING COMPREHENSIVE INCOME (SFAS 130). SFAS
130 establishes new rules for the reporting and display of comprehensive income
and its components. Comprehensive income is the same as net income as there are
no applicable adjustments reported in shareholders' deficit. Accordingly, the
adoption of this statement had no impact on the Company's net income or
shareholders' deficit.

    Effective January 1, 1998, the Company adopted the Statement of Financial
Accounting Standards No. 131, DISCLOSURES ABOUT SEGMENTS OF AN ENTERPRISE AND
RELATED INFORMATION (SFAS 131). SFAS 131 requires public business enterprises to
report information about operating segments in annual financial statements and
requires those enterprises to report selected information about operating
segments in interim financial reports. The adoption of SFAS 131 did not have a
significant effect on the disclosure of segment information as the Company
continues to consider its business activities as a single segment.

    Other recently issued Statements of Financial Accounting Standards up
through and including the most recently issued SFAS, SFAS 137, are not
applicable to the Company.

                                      F-9
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

2. PROPERTY AND EQUIPMENT

    Property and equipment, including capital leases, are summarized as follows
at December 31 (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                                               1997       1998
                                                                             ---------  ---------
<S>                                                                          <C>        <C>
Computer equipment.........................................................  $   1,123  $   2,550
Furniture & fixtures.......................................................        149        284
Office equipment...........................................................         43         58
Leasehold improvements.....................................................         14         98
Software...................................................................        155        416
Trade show equipment.......................................................         92        187
                                                                             ---------  ---------
                                                                                 1,576      3,593
Less accumulated depreciation..............................................        379      1,153
                                                                             ---------  ---------
                                                                             $   1,197  $   2,440
                                                                             ---------  ---------
                                                                             ---------  ---------
</TABLE>

3. BANK LINES OF CREDIT

    The Company has a line of credit with a bank in the amount of $1,000,000
which bears interest at the bank's prime rate (7.75% at December 31, 1998). As
of December 31, 1998 the Company had no outstanding balance under the line of
credit. The line of credit is guaranteed by the Company's primary shareholder
and expires October 31, 1999.

    The Company has a line of credit with a bank in the amount of $4,000,000
which is limited to 80% of the eligible accounts receivable and bears interest
at the bank's prime rate (7.75% at December 31, 1998). As of December 31, 1998,
the Company had no outstanding balance under the line of credit. The line of
credit is secured by certain accounts receivable and is guaranteed by the
Company's primary shareholder. As of December 31, 1998, the Company has
availability of approximately $2,700,000 under this line of credit. This line of
credit expires October 31, 1999.

    The Company had a line of credit with a bank in the amount of $500,000 which
bore interest at the bank's prime rate (7.75% at December 31, 1998). As of
December 31, 1998 the Company had no outstanding balance under the line of
credit. The line of credit was guaranteed by the Company's primary shareholder
and expired April 30, 1999.

    In June, 1999 the Company obtained a commitment from the Company's primary
lender to extend the Company a $5,000,000 unsecured line of credit contingent
upon the Company successfully completing its initial public offering, the
negotiation and execution of definitive documents and other customary
conditions. When obtained, the line of credit will most likely be subject to
certain restrictive covenants that, among other things, will limit the Company's
ability to incur additional indebtedness or pay dividends and will require the
Company to maintain prescribed debt to equity and fixed charge coverage ratios
and minimum net worth levels.

    The Company paid $43,232, $132,704, and $199,433 of interest in 1996, 1997,
and 1998, respectively.

                                      F-10
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

4. RELATED PARTY TRANSACTIONS

    At December 31, 1998 the Company had notes payable of $7,056,000 with its
primary shareholder. The notes payable and related interest, accruing at a rate
of 10% per annum ($227,862 and $913,367 at December 31, 1997, and 1998,
respectively), are due December 31, 2001. There was no interest expense on the
notes payable in 1996. Interest expense on the notes payable was $227,862, and
$685,505 in 1997 and 1998, respectively. The notes payable are subordinated to
the outstanding lines of credit.

    On December 2, 1996 and December 10, 1996, the Company issued 1,875,000 and
1,642,500 shares of Common Stock to its primary shareholder for consideration
totaling $469,000. On July 31, 1998, the Company converted $3,000,000 of debt
owed to its primary shareholder into 1,000,000 shares of Common Stock. On
February 12, 1999, the Company converted $1,100,000 of amounts owed to its
primary shareholder into 111,111 shares of Common Stock.

    The Company paid to a minority shareholder $2,000 in 1996, $905,000 in 1997
and $871,000 in 1998 for voice processing boards and related technology and
services.

    The Company's primary shareholder is a director and 25% shareholder in a
telemarketing company that provides both telemarketing and fulfillment services
to the Company. In 1998, the Company paid approximately $110,000 for these
services to the telemarketing company.

5. SHAREHOLDERS' EQUITY

    On April 16, 1999, the Company authorized an increase in the authorized
common stock to 100,000,000 and established a par value of $.01 on the common
stock. At the same time, the Company authorized 10,000,000 shares of no par
value preferred stock. In addition, on April 16, 1999, the Company adopted the
1999 Stock Option Plan and the Directors' Stock Option Plan. In conjunction with
the adoption of these 1999 Stock Option Plans the Company will no longer issue
stock options under the 1995 Stock Option Plans.

    COMMON STOCK OPTIONS  The Company's Stock Option Plans, adopted in 1995 and
1999, authorize the granting of incentive and nonqualified stock options. The
Board of Directors has approved up to an aggregate of 3,900,000 shares for
issuance under the 1999 Stock Option Plans. The exercise price of the options
must not be less than the fair market value of the common stock at the date of
grant for incentive options. Options granted under the 1995 and 1999 Stock
Option Plans generally vest over five and four years, respectively. Options
generally become exercisable in equal annual installments on the anniversaries
of the date of grant. The term of each option is ten years from the date of
grant. However, in the case of an option granted to an employee who, at the time
the option is granted, owns stock representing more than ten percent of the
voting power of all classes of stock of the Company, the term of the option
shall be five years from the date of grant. The plans may be terminated by the
Board of Directors at anytime. Through June 30, 1999, the Board of Directors had
also issued 97,500 nonqualified stock options outside of the 1995 and 1999 Stock
Option Plans.

    No compensation expense was recognized in 1996, 1997 or 1998. The Company
recognized compensation expense of approximately $19,000 in 1999.

                                      F-11
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

5. SHAREHOLDERS' EQUITY (CONTINUED)
    Stock option activity is summarized as follows:

<TABLE>
<CAPTION>
                                                                                                              SIX MONTHS ENDED
                                         1996                    1997                      1998                JUNE 30, 1999
                                ----------------------  -----------------------  ------------------------  ----------------------
                                            WEIGHTED                 WEIGHTED                  WEIGHTED                WEIGHTED
                                             AVERAGE                  AVERAGE                   AVERAGE                 AVERAGE
                                            EXERCISE                 EXERCISE                  EXERCISE                EXERCISE
                                 OPTIONS      PRICE      OPTIONS       PRICE       OPTIONS       PRICE      OPTIONS      PRICE
                                ---------  -----------  ----------  -----------  -----------  -----------  ---------  -----------
<S>                             <C>        <C>          <C>         <C>          <C>          <C>          <C>        <C>
Options outstanding, beginning
  of period...................  1,092,083   $    0.13    1,727,633   $    0.13     2,331,683   $    0.39   2,348,903        $1.25
Options granted...............    635,550        0.13      862,050        0.84       730,500        3.13     418,500         9.12
Options exercised.............         --          --     (241,500)       0.13      (626,280)       0.21    (480,749)        0.30
Options canceled..............         --          --      (16,500)       0.87       (87,000)       1.37     (29,700)        2.51
                                ---------               ----------               -----------               ---------
Options outstanding, end of
  period......................  1,727,633   $    0.13    2,331,683   $    0.39     2,348,903   $    1.25   2,256,954        $2.91
                                ---------               ----------               -----------               ---------
                                ---------               ----------               -----------               ---------
Option price range at end of
  period......................  $    0.13               $0.13-0.87               $ 0.13-8.33                          $0.13-10.52
Options available for grant at
  period end..................  2,397,367                1,551,817                   908,317                            3,676,875
Weighted average fair value of
  options granted during the
  period......................  $    0.03               $     0.29               $      1.16                                $2.85
</TABLE>

    The following table summarizes information about the options outstanding at
June 30, 1999:

<TABLE>
<CAPTION>
                                OPTIONS OUTSTANDING
                              ------------------------    OPTIONS EXERCISABLE
                               WEIGHTED                 ------------------------
                   NUMBER       AVERAGE     WEIGHTED      NUMBER      WEIGHTED
                 OUTSTANDING   REMAINING     AVERAGE    EXERCISABLE    AVERAGE
   RANGE OF      AT JUNE 30,  CONTRACTUAL   EXERCISE    AT JUNE 30,   EXERCISE
EXERCISE PRICES     1999         LIFE         PRICE        1999         PRICE
- ---------------  -----------  -----------  -----------  -----------  -----------
<S>              <C>          <C>          <C>          <C>          <C>
          $0.13     538,704    6.8 years    $    0.13      165,624    $    0.13
          $0.87     622,950    8.1 years    $    0.87      120,270    $    0.87
     $2.67-3.00     640,050    9.1 years    $    2.83      118,710    $    3.00
          $8.33     171,375    9.5 years    $    8.33           --           --
    $9.33-10.52     283,875    9.9 years    $    9.50           --           --
</TABLE>

    Pro forma information regarding net income is required by SFAS 123, which
also requires that the information be determined as if the Company has accounted
for its employee stock options granted subsequent to December 31, 1994 under the
fair value method of that Statement. The fair value of these options was
estimated at the date of grant using the minimum value pricing model with the
following weighted-average assumptions for 1996, 1997, and 1998 respectively:
risk-free interest rates of 5.5%, 5.5%, and 5.0%; a dividend yield of 0%; and a
weighted-average expected life of the option of 7.5 years. Because the Company's
employee stock options have characteristics significantly different from those
of traded options, and because changes in the subjective input assumptions can
materially affect the fair value estimate, in management's opinion, the existing
models do not necessarily provide a reliable single measure of the fair value of
its employee stock options.

                                      F-12
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

5. SHAREHOLDERS' EQUITY (CONTINUED)
    For purposes of pro forma disclosures, the estimated fair value of the
options is amortized to expense over the options' vesting period. The Company's
pro forma information follows (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                                  1996       1997       1998
                                                                ---------  ---------  ---------
<S>                                                             <C>        <C>        <C>
Pro forma net loss............................................  $  (1,388) $  (5,485) $  (7,730)
Pro forma loss per share......................................  $   (0.33) $   (0.72) $   (0.88)
</TABLE>

    Because SFAS 123 is applicable only to options granted subsequent to
December 31, 1994, and because the Company's options generally vest over a
4-year to 5-year period, the pro forma effect of SFAS 123 will not be fully
reflected until future years.

6. LEASE AGREEMENTS

    The Company leases its headquarters facilities under non-cancelable
operating lease agreements which expire on various dates through April of 2003.
In September 1998, the Company entered into a five year lease agreement
commencing in March 1999 for 36,797 square feet of office space for its
corporate headquarters in Indianapolis, Indiana.

    The Company had $488,297 and $1,809,104 of primarily computer equipment at
December 31, 1997 and 1998, respectively, under a lease line. The lease expires
in December 2000, is secured by the purchased assets and is also guaranteed by
the Company's primary shareholder.

    Minimum future lease payments under non-cancelable capital and operating
leases as of December 31, 1998 are summarized as follows (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                                            CAPITAL    OPERATING
                                                                            LEASES      LEASES
                                                                           ---------  -----------
<S>                                                                        <C>        <C>
1999.....................................................................  $     656   $     818
2000.....................................................................        624         977
2001.....................................................................        394         930
2002.....................................................................         --         942
2003.....................................................................         --         891
Thereafter...............................................................         --         297
                                                                           ---------  -----------
Total minimum lease payments.............................................      1,674   $   4,855
                                                                                      -----------
                                                                                      -----------
Less: amount representing interest.......................................       (196)
                                                                           ---------
Present value of lease payments..........................................      1,478
Less: current portion....................................................       (541)
                                                                           ---------
Long-term portion........................................................  $     937
                                                                           ---------
                                                                           ---------
</TABLE>

    The Company also rents office space for sales offices under month-to-month
leases and leases with terms generally less than one year. Rent expense was
$88,055, $198,303, and $441,030 for 1996, 1997, and 1998, respectively.

                                      F-13
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

7. CONCENTRATIONS OF RISK

    Six resellers represented approximately 55% and 41% of the accounts
receivable balance at December 31, 1997 and 1998, respectively. At June 30, 1999
six resellers represented approximately 36% of our outstanding accounts
receivable balance (unaudited). One international reseller accounted for
approximately 17% of revenues in 1997 and no reseller accounted for 10% or more
of revenues in 1998. The Company evaluates the credit worthiness of its
customers on a periodic basis. The Company generally does not require
collateral.

    The Company has one supplier of voice processing boards that are necessary
for the operation of the Company's software product. If the supplier becomes
unable or unwilling to continue to manufacture and supply these voice processing
boards in the volume, price and technical specifications the Company requires,
then the Company would have to adapt its products to a substitute supplier.

8. 401(K) RETIREMENT SAVINGS PLAN

    The Company maintains a 401(k) retirement savings plan to provide retirement
benefits for substantially all of its employees. Participants in the plan may
elect to contribute up to 20% of their annual compensation to the plan, limited
to the maximum amount allowed by the Internal Revenue Code. The Company, at its
discretion, may make annual contributions to the plan. The Company has made no
contributions to the plan through December 31, 1998.

9. INCOME TAXES

    Effective November 5, 1998, the Company terminated its S-corporation status
for income tax purposes. From that date forward, the taxable income or loss from
operations is includable in the federal and state income tax returns of the
Company.

    FASB Statement No. 109, ACCOUNTING FOR INCOME TAXES, requires recognition of
deferred tax liabilities and assets for the expected future tax consequences of
events that have been included in the financial statements or tax returns.
Accordingly, deferred tax liabilities and assets are determined based on the
difference between the financial statement and tax basis of assets and
liabilities. The Company has a net operating loss carryforward of approximately
$1 million at December 31, 1998 available to offset future taxable income for
federal income tax purposes. The carryforward will expire in 2018. Due to the
uncertainty of the realization of the benefits of its favorable tax attributes
in the future, the Company has established a valuation allowance against its
deferred tax assets as of the S-corporation

                                      F-14
<PAGE>
                         INTERACTIVE INTELLIGENCE, INC.

             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)

                (INFORMATION PERTAINING TO THE SIX MONTHS ENDED
                      JUNE 30, 1998 AND 1999 IS UNAUDITED)

9. INCOME TAXES (CONTINUED)
termination date and December 31, 1998. Significant components of the Company's
net deferred taxes at December 31 are as follows (IN THOUSANDS):

<TABLE>
<CAPTION>
                                                                                1998
                                                                              ---------
<S>                                                                           <C>
Deferred tax assets:
  Accrued shareholder interest payable......................................  $     356
  Net operating loss........................................................        258
  Other.....................................................................        198
                                                                              ---------
Total deferred tax assets...................................................        812
  Valuation allowance.......................................................       (812)
                                                                              ---------
Net deferred taxes..........................................................  $      --
                                                                              ---------
                                                                              ---------
</TABLE>

    The Company did not record any current or deferred federal, state or foreign
income tax provision or benefit for any of the periods presented due to
experiencing operating losses since inception.

10. SEGMENT DISCLOSURES

    Revenues derived from non-North American customers accounted for
approximately 17% and 16% of the Company's total revenues in 1997 and 1998,
respectively and 20% in the first six months of 1999. Non-North American
revenues were predominantly derived from:

    - Ireland (100%) in 1997;

    - Sweden (25%), South Africa (18%), Germany (14%), the United Kingdom (7%)
      and the Philippines (6%) in 1998; and

    - The United Kingdom (39%), the Netherlands (17%), Italy (10%), South Africa
      (9%), New Zealand (8%), Germany (7%) and Norway (6%) in the first six
      months of 1999.

    The Company attributes its revenues to countries based on the country in
which the end-user customer is located. Substantially all of the Company's
long-lived assets are in the United States.

11. CONTINGENCIES

    In June 1999, the Company received a letter from a competitor in the call
center market claiming that the Company's products utilize technologies
pioneered and patented by that competitor. The Company's patent counsel has
reviewed all of the patents listed in the letter from the competitor. Based upon
the advice of the Company's patent counsel, the Company believes that its
products do not infringe any of the patents listed. The Company intends to
discuss its conclusion with the competitor, but cannot assure you that the
competitor will concur with the Company's conclusion or that this matter can be
resolved amicably, without infringement claims being made by the competitor or
without a material adverse effect on the Company's business, financial condition
or results of operations.

12. SUBSEQUENT EVENT--STOCK SPLIT

    On July 9, 1999, the Board of Directors declared a three-for-two stock split
effective July 12, 1999. All common share and per share amounts and information
concerning stock option plans have been adjusted retroactively to give effect to
this stock split.

                                      F-15
<PAGE>
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    Through and including October 17, 1999 (the 25th day after the date of this
prospectus), all dealers effecting transactions in these securities, whether or
not participating in this offering, may be required to deliver a prospectus.
This is in addition to the dealers' obligations to deliver a prospectus when
acting as underwriters and with respect to their unsold allotments or
subscriptions.

                                2,670,000 SHARES

                                     [LOGO]

                         INTERACTIVE INTELLIGENCE, INC.

                                  COMMON STOCK

                                ---------------

                              P R O S P E C T U S
                                ----------------

                              MERRILL LYNCH & CO.
                               HAMBRECHT & QUIST
                           U.S. BANCORP PIPER JAFFRAY

                               SEPTEMBER 22, 1999

- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------


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