AMERICAN TELESOURCE INTERNATIONAL INC
S-3, 2000-11-15
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>

As filed with the Securities and Exchange Commission on November 15, 2000


                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM S-3

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                    AMERICAN TELESOURCE INTERNATIONAL, INC.
             (Exact name of registrant as specified in its charter)

                                    Delaware
         (State or other jurisdiction of incorporation or organization)

                                   74-2849955
                    (I.R.S. Employer Identification Number)

           6000 Northwest Parkway, Suite 110 San Antonio, Texas 78249
                                 (210) 547-1000
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                    Arthur L. Smith, Chief Executive Officer
           6000 Northwest Parkway, Suite 110 San Antonio, Texas 78249
                                 (210) 547-1000
(Name, address, including zip code and telephone number, including area code, of
                               agent for service)

Approximate date of commencement of proposed sale to the public:  From time to
time after the effective date of this Registration statement.

If only the securities being registered on this Form are being offered pursuant
to a dividend or interest reinvestment plans, please check the following box.
/__/

If any of the securities being registered on this Form are to be offered on a
delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  / X /
                                               ---

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the Securities Act registration statement number of the earlier effective
registration statement for the same offering. /___/
<PAGE>

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under
the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. /___/

If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. /___/

                        CALCULATION OF REGISTRATION FEE
<TABLE>
<CAPTION>
==========================================================================================================
                                                           Proposed
                                                           Maximum           Proposed
               Title of                      Amount        Offering           Maximum          Amount of
              Securities                     To be          Price            Aggregate        Registration
           To be Registered                Registered     Per Share        Offering Price         Fee
                                               (1)           (2)               (1)(2)
----------------------------------------------------------------------------------------------------------
<S>                                     <C>             <C>             <C>                 <C>
Resale of common stock issuable upon
 conversion of convertible preferred
 stock                                     12,121,212           $1.50          $18,181,818       $4,800.00
----------------------------------------------------------------------------------------------------------
Resale of common stock issuable upon
 exercise of warrants granted as
 finder's fee                                 175,000           $1.50          $   262,500       $   69.30
----------------------------------------------------------------------------------------------------------
Resale of common stock issued upon
 the exercise of warrants                   7,272,728           $1.50          $10,909,092       $2,880.00
==========================================================================================================
</TABLE>

(1)  For purposes of estimating the number of shares of common stock to be
included in this Registration Statement, the registrant calculated 200% of the
number of shares of common stock issuable in connection with the conversion of
the Company's Series E Convertible Preferred Stock (based on a conversion price
of $1.65 which is 120% of the closing bid price on October 12, 2000) and the
exercise of the Warrants. In addition to the shares set forth in the table, the
amount to be registered includes an undetermined number of shares issuable upon
conversion of or in respect of the Series E Convertible Preferred Stock and the
Warrants, as such number may be adjusted as a result of stock splits, stock
dividends and similar transactions in accordance with Rule 416.

(2)  Calculated pursuant to Rule 457 (c), using the average of the high and low
prices reported on November 10, 2000, solely for the purpose of calculating the
Registration Fee

     The Registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the Registrant shall
file a further amendment which specifically states that this registration
statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933 or until the registration statement shall become
effective on such date as the SEC, acting pursuant to said Section 8(a) may
determine.
<PAGE>

PROSPECTUS NOT COMPLETE

          [Not Yet Issued]


                       19,568,940 Shares of Common Stock

                    AMERICAN TELESOURCE INTERNATIONAL, INC.

     Investing in our common stock involves a high degree of risk.  See "Risk
Factors" beginning on page 3.

     The selling stockholders identified on page 26 of this prospectus are
offering these shares of common stock for resale.  We will not receive any of
the proceeds from the sale of the common stock by the selling stockholders.

     Our common stock is traded on the American Stock Exchange under the symbol
"AI".  On November 10, 2000, the closing price of our common stock was $1.50 per
share.

     The shares of common stock described in this prospectus are issuable upon
the conversion of our Series E Preferred Stock and warrants that we sold to the
selling stockholders in a private placement.  If all of the shares of our Series
E Preferred Stock were converted and all of the warrants exercised on November
10, 2000, these shares would have converted into or been exercised for 9,696,970
shares of our common stock.



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

                               TABLE OF CONTENTS

<TABLE>
<S>                                                         <C>
RELY ONLY UPON THIS PROSPECTUS............................   1
ATSI......................................................   1
RISK FACTORS..............................................   3
DESCRIPTION OF OUR CAPITAL STOCK..........................  17
USE OF PROCEEDS...........................................  25
COMMON STOCK ISSUED.......................................  25
SELLING STOCKHOLDERS......................................  26
PLAN OF DISTRIBUTION......................................  27
LEGAL MATTERS.............................................  29
EXPERTS...................................................  29
WHERE YOU CAN FIND MORE INFORMATION.......................  29
</TABLE>

                          FORWARD-LOOKING STATEMENTS

     This prospectus and the documents incorporated by reference in this
prospectus contain "forward-looking statements."  "Forward looking statements"
are those statements, which describe management's beliefs and expectations about
the future.  We have identified forward-looking statements in this prospectus by
using words such as "anticipate," "believe," "could," "estimate," "may,"
"could," "expect," and "intend."  Although we believe these expectations are
reasonable, our operations involve a number of risks and uncertainties,
including those described in the Risk Factors section of this prospectus.
Therefore, these types of statements may prove to be incorrect.
<PAGE>

                         RELY ONLY ON THIS PROSPECTUS

     You should rely only on the information provided or incorporated by
reference in this prospectus or any supplement.  We have not authorized anyone
to provide you with different information.  This prospectus may be used only in
states and other jurisdictions where it is legal to sell the common stock.  The
information contained in this prospectus is accurate only as of the date of this
prospectus, regardless of the time of delivery of this prospectus or the sale of
any shares.

                                      ATSI

     American TeleSource International, Inc., or ATSI, is a communications
company focusing on the market for wholesale and retail services between the
United States and Latin America, and within Latin America.  In 1993, we began
assembling a framework of licenses, interconnection and service agreements,
network facilities and distribution channels so that we would be in a position
to take advantage of the de-monopolization of the Latin American
telecommunications market, as well as the increasing demand for services in this
market.  Most of our current operations involve services between the U.S. and
Mexico or within Mexico.  We have some operations in Central America as well,
and may expand our operations in the rest of Latin America as the regulatory
environment permits.

     Our 70% - owned subsidiary, GlobalSCAPE, Inc., sells proprietary Internet
productivity software, CuteFTP(R,) CuteHTML(R) , CuteZIP(TM), CuteMAP and
CuteMX(TM). On September 12, 2000 we distributed approximately 30% of the stock
of GlobalSCAPE to our stockholders of record on July 14, 2000.

     We have had operating losses for almost every quarter since we began
operations in 1994.  Our auditors' opinion on our financial statements as of
July 31, 2000 calls attention to substantial doubt as to our ability to
continue as a going concern.  This means that they question whether we can
continue in business.  We have experienced difficulty in paying our vendors and
lenders on time in the past, and may experience difficulty in the future.  If we
are unable to pay our vendors and lenders on time, they may stop providing
critical services or repossess critical equipment that we need to stay in
business.  We do not know when we will achieve profitability, so to stay in
business we will almost certainly have to borrow money or sell additional stock.
We do not know if we will be able to borrow money or sell additional stock on
terms we find acceptable.

  Our strategy for the future is to maximize the use of our current
infrastructure between Mexico and the United States, while focusing on expanding
our retail customer base in Mexico and the United States.  We also want to
expand our network infrastructure in Mexico to reduce costs.  We want to
increase the ratio of retail traffic vs. wholesale traffic because we believe
that retail traffic is less volatile than wholesale traffic, and retail
customers pay more for our services than wholesale customers.  Retail traffic
should therefore produce greater profit margins than wholesale traffic.  Our
defined retail target market will be Mexico's underserved and underdeveloped
markets and Latino markets in the United States, where we plan to offer services
that will function regardless of the user's location north or south of the
U.S./Mexico border, such

                                       1
<PAGE>

as enhanced prepaid calling services. Our marketing term for these types of
services is "borderless."

  For the year ended July 31, 2000, the percentage of revenues generated by our
wholesale, retail and Internet e-commerce business was 63%, 24% and 13%,
respectively. Additional financial information can be found in our Form 10-K
filed November 14, 2000 for the year ended July 31, 2000.

  In July 2000 we acquired Grupo Intelcom, S.A. de C.V., a Mexican company,
which owns a long distance license issued by the Mexican government, for a total
purchase price of approximately $4,176,000 consisting of $755,000 in cash,
$500,000 in the form of a note and 400,000 shares of our common stock. We also
issued 100,000 warrants exercisable at $6.00 for a period of three years to the
principal owner of Grupo Intelcom.

  Prior to acquiring Grupo Intelcom and its long distance license we relied on
other Mexican-licensed long distance carriers to transport our traffic between
our facilities in Mexico and the local telephone company in Mexico.  By
obtaining our own long distance license, we will be able to connect directly to
the local telephone company in Mexico.  We expect this to reduce our costs
significantly beginning in the first calendar quarter of 2001.  This will also
allow us to implement our retail strategy more effectively and efficiently.

  We have also signed a definitive agreement to acquire Genesis Communications
International, Inc., a privately owned telecommunications company focusing on
the Latino market in the United States. The acquisition of Genesis will allow us
to expand our retail presence in the United States.

Potential Dilution

  As of November 10, 2000, we had 67,986,944 shares of common stock outstanding.

  The table below shows the potential dilution of our common stock resulting
from the issuance of the shares of common stock that are included for resale in
the registration statement of which this prospectus is a part. The table assumes
a conversion price of $1.65 per share and the issuance of all 10,000 shares of
Series E Preferred Stock. For more information on the calculation of the
conversion price, you should read the information under "Our Capital Stock -
Features of Series E Preferred Stock."

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------
                                     # of shares issued at     % of total number
Name                                conversion  price of $         of shares
                                             1.65                 outstanding
---------------------------------------------------------------------------------------
<S>                                 <C>                        <C>
Common stock resulting from
 conversion of Series E                            6,060,606                7.78%
 Preferred Stock
---------------------------------------------------------------------------------------
Common stock resulting from the
 exercise of warrants associated
 with the equity line of credit                      175,000     Less than 1%

---------------------------------------------------------------------------------------
Common stock resulting from the
 exercise of warrants associated
 with the Series E Preferred                       3,636,364                4.67%
 Stock
---------------------------------------------------------------------------------------
</TABLE>

                                       2
<PAGE>

<TABLE>
<S>                                               <C>                      <C>
----------------------------------------------------------------------------------------
Total                                              9,871,970                12.68%
----------------------------------------------------------------------------------------
</TABLE>


     Additionally, our Series A Preferred Stock converts to 1,754,517 shares of
common stock and our Series D Preferred Stock converts to common stock at a
discount to market. We do not know how many shares of common stock will be
issued upon conversion of the Series D Preferred Stock. The Series D Preferred
Stock is convertible into common stock based on a floating rate that is a
discount of the common stock price at the time of conversion.   The conversion
price for the Series D Preferred Stock as of November 10, 2000 was $1.25, which
means that if the holder had converted all of its Series D Preferred Stock on
that date we would have issued 2,409,639 shares of common stock. However, due to
the fluctuating conversion rate, we do not know the number of shares of common
stock that will be issued on conversion of the Series D Preferred Stock, and the
number of shares may be materially higher or lower than this.

     We also have the right, but not the obligation, to issue up to 5 million
shares of common stock under an equity line of credit at 92% of the market price
of our common stock at the time of issuance. As of November 10, 2000, the total
number of shares that would be issued upon full conversion of the Series A, D
and E Preferred Stock and all outstanding options and warrants to purchase
common stock, and if we issued the full 5.0 million shares of common stock under
our equity line of credit would be 17,171,204 shares, which would represent
approximately 20% of the total outstanding shares of common stock.

                                 RISK FACTORS

          The purchase of our common stock is very risky.  You should not invest
any money that you cannot afford to lose.  Before you buy our stock, you should
carefully read this entire prospectus.  We have highlighted for you below all of
the material risks to our business that we are aware of.

                          RISKS RELATED TO OPERATIONS

 .  Our auditors have questioned our viability

   Our auditors' opinion on our financial statements as of July 31, 2000 calls
   attention to substantial doubts as to our ability to continue as a going
   concern. This means that they question whether we can continue in business.
   If we cannot continue in business, our common stockholders would likely lose
   their entire investment. Our financial statements are prepared on the
   assumption that we will continue in business. They do not contain any
   adjustments to reflect the uncertainty over our continuing in business.

 .  We expect to incur losses, so if we do not raise additional capital we may go
   out of business

   We have never been profitable and do not expect to become profitable in the
   near future. We have invested and will continue to invest significant amounts
   of money in our network and personnel in order to maintain and develop the
   infrastructure we need to compete in the

                                       3
<PAGE>

  markets for our services and achieve profitability. Our investment in our
  network may not generate the savings and revenues that we anticipate because
  of a variety of factors, such as:

          -  delays in negotiating acceptable interconnection agreements with
             Telefonos de Mexico, the former monopoly carrier in Mexico;
          -  delays in construction of our network; and
          -  operational delays caused by our inability to obtain additional
             financing in a timely fashion.

  In the past we have financed our operations almost exclusively through the
  private sales of securities.  Since we are losing money, we must raise the
  money we need to continue operations and expand our network either by selling
  more securities or borrowing money.  We are not able to sell additional
  securities or borrow money on terms as desirable as those available to
  profitable companies, and may not be able to raise money on any acceptable
  terms.  If we are not able to raise additional money, we will not be able to
  implement our strategy for the future, and we will either have to scale back
  our operations or stop operations.

  As of July 31, 2000 we had negative working capital of approximately $5.3
  million. In order to maintain our financial position going forward it will be
  necessary for us to raise funds necessary to cover our recurring negative cash
  flows from operations. We cannot estimate what that amount will be with
  reasonable certainty. For the twelve months ended July 31, 2000, our negative
  cash flows from operations prior to debt service and capital expenditures were
  approximately $4.7 million. Conservatively, we will need to be able to raise
  similar capital over the next nine to twelve months.

 . We must expand and operate our network.

  Our success and ability to increase our revenues depends upon our ability to
  deliver telecommunication services which, in turn, depends on our ability to
  integrate new and emerging technologies and equipment into our network and to
  successfully expand our network.  Our ability to continue to expand, operate
  and develop our network will depend on, among other factors, our ability to
  accomplish the following:

          -  obtain switch sites;
          -  interconnect with the local, public switched telephone network
             and/or other carriers; and
          -  obtain access to or ownership of transmission facilities that link
             our switches to other network switches.

  When we expand our network, we will incur additional fixed operating costs
  that will exceed revenues until we generate additional traffic.  We may not be
  able to expand our network in a cost effective manner, generate additional
  revenues which cover or exceed the expansion costs or operate the network
  efficiently.

  Our network and operations face risks that we cannot control, such as damages
  caused by

                                       4
<PAGE>

  fire, power loss and natural disasters.  Any failure of our network
  or other systems our hardware could damage our reputation, result in loss of
  customers and harm our ability to obtain new customers.

 . It is difficult for us to  compete with much larger companies such as
  AT&T, Sprint, MCI-Worldcom and Telmex

  The large carriers such as AT&T, Sprint and MCI/Worldcom in the U.S., and
  Telmex in Mexico, have more extensive owned networks than we do, which enables
  them to control costs more easily than we can.  They are also able to take
  advantage of their large customer base to generate economies of scale,
  substantially lowering their per-call costs.  Therefore, they are better able
  than we are to lower their prices as needed to retain customers.  In addition,
  these companies have stronger name recognition and brand loyalty, as well as a
  broader portfolio of services, making it difficult for us to attract new
  customers.  Our competitive strategy in the U.S. revolves around targeting
  markets that are largely underserved by the big carriers.  However, some
  larger companies are beginning efforts or have announced that they plan to
  begin efforts to capture these markets.

  Mergers, acquisitions and joint ventures in our industry have created and may
  continue to create more large and well-positioned competitors.  These mergers,
  acquisitions and joint ventures could increase competition and reduce the
  number of customers that purchase wholesale service from us.

 . Competition could harm us

  International telecommunications providers like ourselves compete on the basis
  of price, customer service, transmission quality and breadth of service
  offerings.  Our carrier and prepaid card customers are especially price
  sensitive.  Many of our larger competitors enjoy economies of scale that can
  result in lower termination and network costs.  This could cause significant
  pricing pressures within the international communications industry.  In recent
  years, prices for international and other telecommunications services have
  decreased as competition continues to increase in most of the markets in which
  we currently compete or intend to compete.  For example, from October 1999 to
  October 2000, the prevailing price per minute to carry traffic from the U.S.
  to Mexico declined by approximately 41%.  Although we carried more than twice
  as much wholesale traffic in fiscal year 2000 than in fiscal year 1999, we
  only recognized an increase in revenues of approximately 60%.  If these
  pricing pressures continue, we must continue to lower our costs in order to
  maintain sufficient profits to continue in this market.  We believe
  competition will intensify as new entrants increase as a result of the new
  competitive opportunities created by the Telecommunications Act of 1996,
  implementation by the Federal Communications Commission of the United States'
  commitment to the World Trade Organization, and privatization, deregulation
  and changes in legislation and regulation in many of our foreign target
  markets.  We cannot assure you that we will be able to compete successfully in
  the future, or that such intense competition will not have a material adverse
  effect on our business, financial condition and results of operations.

                                       5
<PAGE>

 . Competition in Mexico

  Mexican regulatory authorities have granted concessions to 20 companies,
  including Telmex and Telereunion, to construct and operate public, long
  distance telecommunications networks in Mexico.  Some of these new competitive
  entrants have as their partners major U.S. telecommunications providers
  including AT&T (Alestra), MCIWorldcom (Aventel) and Bell Atlantic Corp.
  (Iusatel).  Mexican regulatory authorities have also granted concessions to
  provide local exchange services to several telecommunications providers,
  including Telmex and Telefonia Inalambrica del Norte S.A. de C.V., Megacable
  Comunicaciones de Mexico and several of Mexico's long distance
  concessionaires.  We compete or will compete to provide services in Mexico
  with numerous other systems integration, value-added and voice and data
  services providers, some of which focus their efforts on the same customers we
  target.  In addition to these competitors, recent and pending deregulation in
  Mexico may encourage new entrants.

  Moreover, while the WTO Agreement could create opportunities to enter new
  foreign markets, the United States' and other countries' implementation of the
  WTO Agreement could result in new competition from operators previously banned
  or limited from providing services in the United States.  For example, the FCC
  granted the Sprint/Telmex joint venture authority, subject to various
  conditions, to enter the United States market and to provide resold
  international switched services between the United States and Mexico.  This
  and other competitive developments could result in increased competition,
  which could materially and adversely effect our business, financial condition
  and results of operations.

 . Our Mexican facilities-based license poses risks

  Our Mexican concession is regulated by the Mexican government.  The Mexican
  government could grant similar concessions to our competitors, or affect the
  value of our concessions.  In addition, the Mexican government also has (1)
  authority to temporarily seize all assets related to the Mexican concession in
  the event of natural disaster, war, significant public disturbance and threats
  to internal peace and for other reasons of economic or public order and (2)
  the statutory right to expropriate any concession and claim all related assets
  for public interest reasons.  Although Mexican law provides for compensation
  in connection with losses and damages related to temporary seizure or
  expropriation, we cannot assure you that the compensation will be adequate or
  timely.

  The Mexican concession contains several restraints.  Specifically, it limits
  the scope and location of our Mexican network and has minimum invested capital
  requirements and specific debt to equity requirements.  We cannot assure you
  that:

     -    we will be able to obtain financing to finish the Mexican network;
     -    if we obtain financing it will be in a timely manner or on favorable
          terms; or
     -    we will be able to comply with the Mexican concession's conditions.

  If we fail to comply with the terms of the concession, the Mexican government
  may terminate it without compensation to us.  A termination would prevent us
  from engaging in our

                                       6
<PAGE>

  proposed business.

 . Rapid changes in technology could place us at a competitive disadvantage

  The markets that we service are characterized by:

     -  rapidly changing technology;
     -  evolving industry standards;
     -  emerging competition; and
     -  the frequent introduction of new services, software and other products.

  Our success partially depends upon our ability to enhance existing products,
  software and services and to develop new products, software and services that
  meet changing customer requirements on a timely and cost-effective basis.  We
  cannot assure you that we can successfully identify new opportunities and
  develop and bring new products, software and services to the market in a
  timely and cost effective manner.  We also cannot assure you that the
  products, software, services or technologies that others develop will not
  render our products, software, services or technologies non-competitive or
  obsolete.  Furthermore, there is no guarantee that products, software or
  service developments or enhancements we introduce will achieve or sustain
  market acceptance or that they will effectively address the compatibility and
  interoperability issues raised by technological changes or new industry
  standards.

 . We may not be able to collect large receivables, which could create serious
  cash flow problems

  Our wholesale network customers generate large receivable balances, often over
  $500,000 for a two-week period.  We incur substantial direct costs to provide
  this service since we must pay our carriers in Mexico to terminate these
  calls.   If a customer fails to pay a large balance on time, our cash flow may
  be substantially reduced and we would have difficulty paying our carriers in
  Mexico on time.  If our Mexican carriers suspend services to us, it may affect
  all our customers.

 . We may not be able to pay our suppliers on time, causing them to discontinue
  critical services

  We have not always paid all of our suppliers on time due to temporary cash
  shortfalls.  Our critical suppliers are SATMEX for satellite transmission
  capacity and Bestel for fiber optic cable.  We also rely on various Mexican
  and U.S. long distance companies to complete the intra-Mexico and intra-U.S.
  long distance portion of our calls.  For fiscal 2000, the monthly average
  amount due to these suppliers as a group was approximately $1,372,000.  We
  currently have overdue outstanding balances with long distance carriers for
  fiscal 2000 of $300,000 on which we are making payments. Critical suppliers
  may discontinue service if we are not able to make payments on time in the
  future.  In addition, equipment vendors may refuse to provide critical
  technical support for their products if they are not paid on time

                                       7
<PAGE>

  under the terms of support arrangements. Our ability to make payments on time
  depends on our ability to raise additional capital or improve our cash flow
  from operations.

 . We may not be able to make our debt payments on time or meet financial
  covenants in our loan agreements, causing our lenders to repossess critical
  equipment

  We purchased some of our significant equipment with borrowed money, including
  a substantial number of our payphones located in Mexico, our DMS 250/350
  International gateway switch from Nortel, and packet-switching equipment from
  Network Equipment Technologies.  We pay these three lenders approximately
  $171,165 on a monthly basis.  Our Form 10-K, which is incorporated by
  reference in this prospectus, includes more information about our equipment,
  equipment debt and capital lease obligations. The lenders have a security
  interest in the equipment to secure repayment of the debt.  This means that
  the lenders may take possession of the equipment and sell it to repay the debt
  if we do not make our payments on time.  We have not always paid all of our
  equipment lenders on time due to temporary cash shortfalls. These lenders may
  exercise their right to take possession of certain critical equipment if we
  are not able to make payments on time in the future.  Our ability to make our
  payments on time depends on our ability to raise additional capital or improve
  our cash flow from operations.  We defaulted on our Nortel switch loan
  agreement as of the end of our fiscal year, July 31, 2000, by failing to meet
  financial covenants related to revenues, gross margins and EBITDA.  The lender
  granted us a waiver of that default, but it appears likely that we will be in
  default of those financial covenants again at the end of the quarter ending
  October 31, 2000. This lender may not grant us a waiver of this expected
  default, meaning that the lender would have the right to repossess this
  equipment under the terms of the loan agreement.  For more information on this
  expected default, you should see the Liquidity and Capital Resources section
  of our 10-K for the year ending July 31, 2000.  For more information on our
  other loans and capital leases you should see the footnotes of our 10-K for
  the year ended July 31, 2000.

 . A large portion of our revenue is concentrated among a few customers, making
  us vulnerable to sudden revenue declines.

  Our revenues from wholesale services currently comprise about 63% of our total
  revenues.   The volume of business sent by each customer fluctuates, but this
  traffic is often heavily concentrated among three or four customers.   During
  some periods in the past, two of these customers have been responsible for 50%
  of this traffic. Generally, our wholesale customers are able to re-route their
  traffic to other carriers very quickly in response to price changes.  If we
  are not able to continue to offer competitive prices, these customers will
  find some other supplier and we will lose a substantial portion of our revenue
  very quickly. In addition, mergers and acquisitions in our industry may reduce
  the already limited number of customers for our wholesale services.

 . We may not be able to lease transmission facilities we need at cost-
  effective rates

  We do not own all of the transmission facilities we need to complete calls.
  Therefore, we depend on contractual arrangements with other telecommunications
  companies to complete

                                       8
<PAGE>

  our network. For example, although we own the switching and transport
  equipment needed to receive and transmit calls via satellite and fiber optic
  lines, we do not own a satellite or any fiber optic lines and must therefore
  lease transmission capacity from other companies. We may not be able to lease
  facilities at cost-effective rates in the future or enter into contractual
  arrangements necessary to expand our network or improve our network as
  necessary to keep up with technological change.

 . The carriers on whom we rely for intra-Mexico long distance may not stay
  in business leaving us fewer and more expensive options to complete calls

  There are only 21-licensed Mexican long distance companies, and we currently
  have agreements with four of them. One of these, Avantel, S.A. de C.V. has
  said publicly that it may not continue in the business because of its
  difficulty in achieving a desired profit margin. If the number of carriers who
  provide intra-Mexico long distance is reduced, we will have fewer route
  choices and may have to pay more for this service.

 . We may have service interruptions and problems with the quality of
  transmission, causing us to lose call volume and customers

  To retain and attract customers, we must keep our network operational 24 hours
  per day, 365 days per year.  We have experienced service interruptions and
  other problems that affect the quality of voice and data transmission.  We may
  experience more serious problems.  In addition to the normal risks that any
  telecommunications company faces (such as fire, flood, power failure,
  equipment failure), we may have a serious problem if a meteor or space debris
  strikes the satellite that transmits our traffic, or a volcanic eruption or
  earthquake interferes with our operations in Mexico City. If a portion of our
  network is affected by such an event, a significant amount of time could pass
  before we could re-route traffic from one portion of our network to the other,
  and there may not be sufficient capacity on only one portion of the network to
  carry all of our traffic at any given time.

  To stay competitive, we will attempt to integrate the latest technologies into
  our network.  We are currently implementing "packet switching" transport
  capabilities such as Asynchronous Transfer Mode and we will continue to
  explore new technologies as they are developed.  Our 10-K describes these
  technologies.  The risk of network problems increases during periods of
  expansion and transition to new technologies.

 . Changes in telecommunications regulations may harm our competitive
  position

  Historically, telecommunications in the U.S. and Mexico have been closely
  regulated under a monopoly system.  As a result of the Telecommunications Act
  of 1996 in the U.S. and new Mexican laws enacted in the 1990's, the
  telecommunications industry in the U.S. and Mexico are in the process of a
  revolutionary change to a fully competitive system.   U.S. and Mexican
  regulations governing competition are evolving as the market evolves.  For
  example, FCC regulations now permit the regional Bell operating companies
  (former local telephone monopolies such as Southwestern Bell) to enter the
  long distance market if certain conditions are met.  The entry of these
  formidable competitors into the long distance market

                                       9
<PAGE>

  will make it more difficult for us to establish a retail customer base. There
  may be significant regulatory changes that we cannot even predict at this
  time. We cannot be sure that the governments of the U.S. and Mexico will even
  continue to support a migration toward a competitive telecommunications
  market.

 . Regulators may challenge our compliance with laws and regulations causing us
  considerable expense and possibly leading to a temporary or permanent shut
  down of some operations

  Government enforcement and interpretation of the telecommunications laws and
  licenses is unpredictable and is often based on informal views of government
  officials and ministries.  This is particularly true in Mexico and certain of
  our target Latin American markets, where government officials and ministries
  may be subject to influence by the former telecommunications monopoly, such as
  Telmex.  This means that our compliance with the laws may be challenged.  It
  could be very expensive to defend this type of challenge and we might not win.
  If we were found to have violated the laws that govern our business, we could
  be fined or denied the right to offer services.


 . Our operations may be affected by political changes in Mexico and other Latin
  American countries

  The majority of our foreign operations are in Mexico.  The political and
  economic climate in Mexico is more uncertain than in the United States and
  unfavorable changes could have a direct impact on our operations in Mexico.
  The Mexican government exercises significant influence over many aspects of
  the Mexican economy.  For example, a newly elected set of government officials
  could decide to quickly reverse the deregulation of the Mexican
  telecommunications industry economy and take steps such as seizing our
  property, revoking our licenses, or modifying our contracts with Mexican
  suppliers. A period of poor economic performance could reduce the demand for
  our services in Mexico.  There might be trade disputes between the United
  States and Mexico that result in trade barriers such as additional taxes on
  our services.  The Mexican government might also decide to restrict the
  conversion of pesos into dollars or restrict the transfer of dollars out of
  Mexico. These types of changes, whether they occur or are only threatened,
  could have a material adverse effect on our results of operations and would
  also make it more difficult for us to obtain financing in the United States.

 . If the value of the Mexican Peso declines relative to the Dollar, we will
  have decreased earnings as stated Dollars

  Approximately 20% of ATSI's revenue is collected in Mexican Pesos.  If the
  value of the Peso relative to the Dollar declines, that is, if Pesos are
  convertible into fewer Dollars, then our earnings, which are stated in
  dollars, will decline.  We do not engage in any type of hedging transactions
  to minimize this risk and do not intend to do so.

 .  We may not successfully integrate the operations of Genesis

                                       10
<PAGE>

  If we are unable to integrate the operations of Genesis Communications
  International, Inc. upon completion of the acquisition, it may adversely
  affect our future operations, specifically, the shift towards and
  implementation of our retail strategy.

                          RISKS RELATED TO FINANCING

 . The terms of our preferred stock include disincentives to a merger or other
  change of control, which could discourage a transaction that would otherwise
  be in the interest of our stockholders.

  In the event of a change of control of ATSI, the terms of the Series D and E
  Preferred Stock permit the holder to choose either to receive whatever cash or
  stock the common stockholders receive in the change of control transaction as
  if the Series D and E Preferred Stock had been converted, or to require us to
  redeem the Series D and E Preferred Stock at $1,560 and $1,250 per share,
  respectively. If all 3,000 and 10,000 shares of the Series D and E Preferred
  Stock were outstanding at the time of a change of control, this could result
  in a payment to the holders of $4,680,000 and $12,500,000, respectively. The
  possibility that we might have to pay this large amount of cash would make it
  more difficult for us to agree to a merger or other opportunity that might
  arise even though it would otherwise be in the best interest of the
  stockholders.

 . We may have to redeem the Series D and Series E Preferred Stock for a
  substantial amount of cash, which would severely restrict the amount of cash
  available for our operations.

  The terms of the Series D Preferred Stock require us to redeem the stock for
  cash in two circumstances in addition to the change of control situation
  described in the immediately preceding risk factor.

  First, the terms of the Series D Preferred Stock prohibit the holder from
  acquiring more than 11,509,944 shares of our common stock, which is 20% of the
  amount of shares of common stock outstanding at the time we issued the Series
  D Preferred Stock.  The terms of the Series D Preferred Stock also prohibit
  the holder from holding more than 5% of our common stock at any given time.
  Due to the floating conversion rate, the number of shares of common stock that
  may be issued on the conversion of the Series D Preferred Stock increases as
  the price of our common stock decreases, so we do not know the actual number
  of shares of common stock that the Series D Preferred Stock will be
  convertible into.  On the second anniversary of the issuance of the Series D
  Preferred Stock we are required to convert all remaining unconverted Series D
  Preferred Stock.  If this conversion would cause the holder to exceed either
  of these limits, then we must redeem the excess shares of Series D Preferred
  Stock for cash equal to $1,270 per share, plus accrued but unpaid dividends.

  Second, if we refuse to honor a conversion notice or a third party challenges
  our right to honor a conversion notice by filing a lawsuit, the holder may
  require us to redeem any shares it then holds for $1,270 per share.  If all
  3,000 shares were outstanding at the time of a redemption, this would result
  in a cash payment of $3,810,000 plus accrued and unpaid

                                       11
<PAGE>

  dividends. If we were required to make a cash payment of this size, it would
  severely restrict our ability to fund our operations.

  Similarly, the Series E Preferred Stock requires mandatory redemption if (a)
  we fail to: issue shares of common stock upon conversion, remove legends on
  certificates representing shares of common stock issued upon conversion or to
  fulfill certain covenants set forth in the Securities Purchase Agreement
  between ATSI and the holders of the Series E Preferred Stock; (b) We fail to
  obtain effectiveness of the registration statement covering the shares of
  common stock to be issued upon the conversion of the Series E Preferred Stock
  prior to March 11, 2001; (c) certain bankruptcy and similar events occur; (d)
  we fail to maintain the listing of the common stock on the Nasdaq National
  Market, the Nasdaq Small Cap Market, the AMEX or the NYSE; or (e) our long
  distance concession license from the Republic of Mexico is terminated or
  limited in scope by any regulatory authorities.  The Redemption Price equals
  the greater of (x) 125% of the stated value ($1,000) plus 6% per annum of the
  stated value plus any conversion default payments due and owing by ATSI and
  (y) the product of (i) the highest number of shares of common stock issuable
  upon conversion times (ii) the highest closing price for the common stock
  during the period beginning on the date of first occurrence of the mandatory
  redemption event and ending one day prior to the date of redemption minus the
  amount of money we receive upon the exercise of the investment options
  provided in the Series E Preferred Stock which, upon conversion allows the
  holders to purchase an additional 0.8 share of ATSI common stock for each
  share of ATSI common stock received upon conversion.

 . We may redeem our preferred stock only under certain circumstances, and
  redemption requires us to pay a significant amount of cash and issue
  additional warrants; therefore we are limited as to what steps we may take to
  prevent further dilution to the common stock if we find alternative forms of
  financing

  We may redeem the Series A Preferred Stock only after the first anniversary of
  the issue date, and only if the market price for our common stock is 200% or
  more of conversion price for the Series A Preferred Stock.  The redemption
  price for the Series A stock is $100 per share plus accrued and unpaid
  dividends.  We may redeem the Series D Preferred Stock only if the price of
  our common stock falls below $9.00, the price on the date of closing the
  Series D Preferred Stock.  The redemption price is $1,270 per share, plus
  accrued but unpaid dividends, plus an additional warrant for the purchase of
  150,000 shares of common stock.  Subject to certain conditions, we have the
  right to redeem the Series E Preferred Stock if, at any time after October 11,
  2001, on any trading day and for a period of 20 consecutive trading days prior
  thereto, the closing bid price is less than $1.24. In the event that we are
  able to find replacement financing that does not require dilution of the
  common stock, these restrictions would make it difficult for us to "refinance"
  the preferred stock and prevent dilution to the common stock.

                                       12
<PAGE>

                 RISKS RELATING TO MARKET FOR OUR COMMON STOCK

 .  The price of our common stock has been volatile and could continue to
   fluctuate substantially

   Our common stock is traded on the AMEX.  The market price of our common stock
   has been volatile and could fluctuate substantially based on a variety of
   factors, including the following:

     -  announcements of new products or technologies innovations by us or
        others;
     -  variations in our results of operations;
     -  the gain or loss of significant customers;
     -  the timing of acquisitions of businesses or technology licenses;
     -  legislative or regulatory changes;
     -  general trends in the industry;
     -  market conditions; and
     -  analysts' estimates and other events in our industry.

 .  Future sales of our common stock in the public market could lower our stock
   price.

   Future sales of our common stock in the public market could lower our stock
   price and impair our ability to raise funds in new stock offerings.  As of
   November 10, 2000, we had 67,986,944 shares of common stock outstanding, of
   which our affiliates held approximately 7,000,000 shares, and 2,091,056
   shares issuable upon exercise of outstanding options and warrants, of which
   approximately 1,113,000 were held by affiliates.  In addition, we had
   19,582,203 shares reserved for issuance upon conversion of our outstanding
   Series A, D and E Preferred Stock (subject to adjustment).  The shares held
   by our affiliates are "restricted shares" and, accordingly, may not be sold
   publicly except in compliance with Rule 144.  The remaining outstanding
   shares of our common stock and the shares issuable upon conversion of our
   preferred stock and exercise of warrants are freely tradable.  In addition,
   we may issue a significant number of additional shares of common stock as
   consideration for acquisitions or other investments as well as for working
   capital.  For example, we have agreed to issue approximately 9.6 million
   shares of our common stock in connection with our acquisition of Genesis.
   Sales of a substantial amount of common stock in the public market, or the
   perception that these sales may occur, could adversely affect the market
   price of our common stock prevailing from time to time in the public market
   and could impair our ability to raise funds in additional stock offerings.

 .  We will likely continue to issue common stock or securities convertible into
   common stock to raise funds we need, which will further dilute your ownership
   of ATSI and may put additional downward pricing pressure on the common stock

   Since we continue to operate at a loss, we will continue to need additional
   funds to stay in business. At this time, we are not likely to be able to
   borrow enough money to continue operations on terms we find acceptable so we
   expect to have to sell more shares of common stock or more securities
   convertible in common stock. Convertible securities will likely have

                                       13
<PAGE>

   similar features to our existing preferred stock, including conversion at a
   discount to market. The sale of additional securities will further dilute
   your ownership of ATSI and put additional downward pricing pressure on the
   stock. From January 1, 1999 to November 10, 2000, we issued 29,793,437 new
   shares of

   common stock on a fully diluted basis, which represents approximately 33% of
   our fully diluted outstanding common stock. The fully diluted outstanding
   common stock includes an assumed number of shares of common stock that have
   not yet been issued, but are issuable upon conversion of convertible
   preferred stock, warrants and stock options. Our convertible preferred stock
   has a conversion price that floats with the market price of our common stock.
   We calculated the number of shares included in this amount by using an
   assumed conversion price based on our market price as of November 10, 2000.
   The actual number of shares that may be issued may be materially higher or
   lower. For more information on dilution, please see page 19.

 .  We have signed an agreement for a private equity line of credit, which could
   further dilute your ownership of ATSI.

   We signed an agreement on April 10, 2000 with an investor under which we may
   require the investor to purchase up to 5 million shares of common stock over
   an eighteen month period at 92% of the market price for our common stock at
   the time of purchase. We are not required to use this credit line facility,
   but if we do use this facility, we must issue to the investor warrants for
   1,500 shares of common stock for every $100,000 that is invested at an
   exercise price of 120% of the average of the five closing sale prices
   preceding the date of the investment, and an additional 1,000 warrants per
   100,000 invested as a finder's fee on the same terms. The sale of additional
   securities would further dilute your ownership of ATSI and put additional
   downward pricing pressure on the stock.

 .  The potential dilution of your ownership of ATSI will increase as our stock
   price goes down, since our preferred stock is convertible at a floating rate
   that is a discount to the market price.

   Our Series A, D and E Preferred Stock is convertible into common stock based
   on a conversion price that is a discount to the market price for ATSI's
   common stock. The conversion price for the Series A Preferred Stock is reset
   each year on the anniversary of the issuance of the stock, and the conversion
   price for the Series D and Series E Preferred Stock floats with the market on
   a day-to-day basis. For each series, the number of shares of common stock
   that will be issued on conversion increases as the price of our common stock
   decreases. Therefore, as our stock price falls, the potential dilution to the
   common stock increases, and the amount of pricing pressure on the stock
   resulting from the entry of the new common stock into the market increases.

 .  Sales of common stock by the preferred holders may cause the stock price to
   decrease, allowing the preferred stock holders to convert their preferred
   stock into even greater amounts of common stock, the sales of which would
   further depress the stock price.

                                       14
<PAGE>

   The terms of the preferred stock may amplify a decline in the price of our
   common stock since sales of the common stock by the preferred holders may
   cause the stock price to fall, allowing them to convert into even more shares
   of common stock, the sales of which would further depress the stock price.

 .  The potential dilution of your ownership of ATSI resulting from our Series D
   and Series E Preferred Stock will increase if we sell additional common stock
   for less than the conversion price applicable to the Series D and Series E
   Preferred Stock.

   The terms of the Series D and Series E Preferred Stock require us to adjust
   the conversion price if we sell common stock or securities convertible into
   common stock at a greater discount to market than that provided for the
   Series D Preferred Stock and at less than the lower of the market price or
   the conversion price with respect to the Series E Preferred Stock. Therefore,
   if we sell common stock or securities convertible into common stock in the
   future on more favorable terms than the discounted terms, we will have to
   issue even more shares of common stock to the holders than initially agreed
   on.

 .  The issuance of our convertible preferred stock may violate the rules of The
   American Stock Exchange, which could result in the delisting of our common
   stock causing us to be traded as an on over-the-counter bulletin board stock
   which could negatively impact our stock price and our ability to raise
   additional capital.

   The rules of The American Stock Exchange, or the AMEX, require that the
   voting rights of existing stockholders may not be disparately reduced or
   restricted through any corporate action or issuance. The AMEX has stated in
   its interpretive materials relating to the exchange rules that floating
   priced convertible securities that vote on an as converted basis, such as our
   Series A Preferred Stock, raise voting rights concerns because of the
   possibility that, due to a decline in the price of the underlying common
   stock the preferred stock holder will having voting rights disproportionate
   to its investment in our company. These interpretive materials also indicate
   that the AMEX may view the issuance of floating rate convertible securities,
   such as our Series A, D or E Preferred Stock as a violation of their rule
   against engaging in operations which are contrary to the public interest
   since the returns on securities of this type may become excessive compared
   with those of public investors in our common stock.

   Should we be delisted from the AMEX, it would be necessary for us to trade as
   an over-the-counter bulletin board stock. It is likely that the act of being
   delisted would depress our stock price allowing preferred stock holders to
   convert their preferred stock into greater amounts of common stock, the sale
   of which could further depress our stock price. Additionally, it is likely
   that it may be more difficult for us to raise additional capital on favorable
   terms if we were no longer listed on a national exchange.

   We expect to issue additional shares of common stock to pay dividends on the
   preferred stock, further diluting your ownership of ATSI and putting
   additional downward pricing pressure on the common stock.

                                       15
<PAGE>

   The Series A Preferred Stock requires quarterly dividends of 10% per annum,
   and the Series D Preferred Stock requires quarterly dividends of 6% per
   annum. We have the option of paying these dividends in shares of common stock
   instead of cash and we expect to use that option. The number of shares of
   common stock that are required to pay the dividends is calculated based on
   the same floating conversion price applicable to the conversion of the
   preferred stock, so the lower our common stock price, the more shares of
   common stock it takes to pay the dividends. The issuance of these additional
   shares of common stock will further dilute your ownership of ATSI and put
   additional downward pricing pressure on the common stock. The amount of
   dividends accrued as of October 31, 2000 is approximately $146,000 on Series
   A Preferred Stock, and approximately $135,000 on the Series D Preferred
   Stock.

 .  We have agreed to issue additional shares as consideration for the purchase
   of Genesis Communications International, Inc.

   We will have to issue up to an additional 9.6 million shares upon the closing
   of this transaction. The entry of these shares will put further market
   pressure on the price of common stock.

   You will almost certainly not receive any cash dividends on the common stock
   in the foreseeable future.

   Sometimes investors buy common stock of companies with the goal of generating
   periodic income in the form of dividends. You may receive dividends from time
   to time on stock you own in other companies. We have no plan to pay dividends
   in the near future.

 .  If the price of common stock falls to a low price for a substantial period of
   time, the AMEX may delist our common stock

   The AMEX has in the past delisted stock that fell below $4 per share for an
   extended period of time. If our common stock falls to this level and is
   delisted, trading in our common stock would be conducted in the over-the-
   counter market on the electronic bulletin board or in the pink sheets
   administered by the NASD. This would likely adversely affect the liquidity of
   the common stock because it would be more difficult for stockholders to
   obtain accurate stock quotations. In addition, if our stock were not traded
   on a national exchange, sales of our stock would likely be subject to the
   SEC's penny stock rules which generally create a delay between the time that
   a stockholder decides to sell shares and the time that the sale may be
   completed.

 .  The partial distribution of shares of our subsidiary GlobalSCAPE will tend to
   decrease the price of our common stock

   On September 14, 2000 we completed a partial distribution of GlobalSCAPE to
   our stockholders. Completion of this transaction partially separates the
   value of GlobalSCAPE that was historically inherent in our stock price and
   may reduce the price of our stock price.

                                       16
<PAGE>

 .  A delay or failure to complete a public offering may have a negative impact
   on us

   If we experience a delay or fail to complete a public offering we may inhibit
   GlobalSCAPE's ability to accelerate the implementation of their business
   plan. Additionally, a delay or failure to complete a public offering may
   adversely impact the influx of further capital into ATSI and/or GlobalSCAPE.

 .  Our Certificate of Incorporation and Bylaws and Delaware law could make it
   less likely that our stockholders receive a premium for their shares in an
   unsolicited takeover attempt

   Certain provisions of our certificate of incorporation, our bylaws and the
   Delaware General Corporation Law could, together or separately, discourage
   potential acquisition proposals or delay or prevent a change in control.
   Currently, those provisions include a classified board of directors, a
   prohibition on written consents in lieu of meetings of the stockholders and
   the authorization to issue up to 10,000,000 shares of preferred stock and up
   to 100,000,000 shares of common stock. Our board of directors has the power
   to issue any or all of these additional shares without stockholder approval,
   subject to the rules of the AMEX that require stockholder approval of the
   issuance of common stock or securities convertible into common stock equal to
   or in excess of 20.0% of the number of shares of common stock or the voting
   power outstanding before the issuance. The preferred shares can be issued
   with such rights, preferences and limitations as may be determined by the
   board. The rights of the holders of common stock will be subject to, and may
   be adversely affected by, the commitments or contracts to issue any
   additional shares of common stock or any shares of preferred stock.
   Authorized and unissued preferred stock and common stock could delay,
   discourage, hinder or preclude our unsolicited acquisition, could make it
   less likely that the stockholders receive a premium for their shares as a
   result of any such attempt and could adversely affect the market price of,
   and the voting and other rights of, the holders of outstanding shares of
   common stock.

                       DESCRIPTION OF ATSI CAPITAL STOCK

     As of November 10, 2000, the authorized and outstanding capital stock of
ATSI consisted of 100,000,000 shares of ATSI common stock, of which 67,986,944
shares were issued and outstanding, and 10,000,000 shares of preferred stock of
which 50,000 shares have been designated as Series A Preferred Stock, of which
17,703 were issued and outstanding, 2,000 shares have been designated as Series
B Preferred Stock, of which no shares were issued and outstanding, 500 have been
designated as Series C Cumulative Convertible Preferred Stock, of which no
shares are issued and outstanding, 3,000 shares have been designated as Series D
Preferred Stock, all of which are issued and outstanding and 15,000 shares of
Series E Cumulative Convertible Preferred Stock, of which 2,500 were issued and
outstanding. At November 10, 2000, the total number of shares and issuable upon
conversion of the Series A, Series D and Series E Preferred Stock, and ATSI's
private equity line of credit was approximately 24.6 million shares of common
stock. ATSI also has an aggregate of 1,540,136 warrants outstanding with an
average exercise price of $1.95 per share and options to purchase 1,460,011
shares of common stock outstanding at an average exercise price of $1.12 per
share.

                                       17
<PAGE>

     The following description provides a summary of the material rights and
limitations relating to ownership of ATSI's common stock.

Common Stock

     Subject to the rights of holders of preferred stock then outstanding,
holders of common stock are entitled to receive such dividends as may from time
to time be declared by the Board of Directors of ATSI. Holders of common stock
are entitled to one vote per share on all matters on which the holders of common
stock are entitled to vote. Because holders of common stock do not have
cumulative voting rights, the holders of a majority of the shares of common
stock represented at a meeting can select all of the directors. In addition,
super majority voting requirements apply in respect of certain stockholder
actions. Holders of common stock have no preemptive rights to subscribe for any
additional securities that ATSI may issue and there are no redemption provisions
or sinking fund provisions applicable to the common stock, nor is the common
stock subject to calls or assessments by ATSI. All shares of common stock are
legally issued, fully paid and nonassessable. Upon the liquidation, dissolution
or winding up of ATSI, holders of the common stock are entitled to share
equally, share-for-share, in the assets available for distribution after payment
to all creditors of ATSI, subject to the rights, if any, of the holders of any
outstanding shares of preferred stock.

Preferred Stock

     Pursuant to the ATSI Certificate of Incorporation, the Board of Directors
of ATSI is authorized, subject to any limitations prescribed by law, to provide
for the issuance of shares of preferred stock from time to time in one or more
Series and to establish the number of shares to be included in each such Series
and to fix the designation, powers, preferences and relative, participating,
optional and other special rights of the shares of each such Series and any
qualifications, limitations or restrictions thereof. Because the Board of
Directors has such power to establish the powers, preferences and rights of each
Series, it may afford the holders of preferred stock preferences, powers and
rights (including voting rights) senior to the rights of the holders of common
stock. The issuance of shares of preferred stock, or the issuance of rights to
purchase such shares, could be used to discourage an unsolicited acquisition
proposal.

     There are currently three Series of preferred stock outstanding: Series A
Preferred Stock, Series D Preferred Stock and Series E Preferred Stock.  The
descriptions of the features of the Series A, Series D and Series E Preferred
Stock set forth below are summaries only and are qualified by ATSI's Certificate
of Incorporation, copies of which are available from ATSI.

Features of Series E Preferred Stock
------------------------------------

  You can find definitions of certain terms used in this description of the
features of our Series E Preferred Stock under the subheading "Certain
Definitions."

------------------------------------------------------------------------------
                           Series E
------------------------------------------------------------------------------
Shares Outstanding         2,500; an additional 7,500 shares to be issued at
                           2/nd/ Closing,
------------------------------------------------------------------------------

                                       18
<PAGE>

------------------------------------------------------------------------------
                           subject to the satisfaction of certain conditions
                           outside of the investors's control. The Company is
                           registering common stock for both closings.
------------------------------------------------------------------------------
Amount Paid Per Share      $1,000
------------------------------------------------------------------------------
Dividends                  None
------------------------------------------------------------------------------
Liquidation Preference     Prior to common stock, shares ratably with Series
                           A and D Preferred Stock; liquidation payment of
                           $1,000 per share outstanding plus 6% per annum.
------------------------------------------------------------------------------
Voting Rights              None, except as required by Delaware law.
------------------------------------------------------------------------------
Conversion Price           Lesser of the Market Price and the Fixed
                           Conversion Price but the Conversion Price shall
                           not be less than the Floor Price.
------------------------------------------------------------------------------
Conversion Time            By the Holders: At any time and from time to time;
                           provided, however, that, subject to certain
                           exceptions, prior to the date which is the later
                           of (a) February 11, 2001 and (b) the date this
                           registration statement (of which this prospectus
                           is a part) is declared effective, the holders may
                           not convert at a price less than $1.24.

                           By ATSI: Subject to certain exceptions, at any
                           time after October 11, 2001.
------------------------------------------------------------------------------
Adjustments to             The conversion price is subject to adjustment for
 Conversion Price          stock  splits, stock dividends and similar events.
                           In addition, if ATSI sells common stock or
                           securities convertible into or exchangeable for
                           common stock at a price less than the conversion
                           price in effect, the conversion price will be
                           adjusted on a weighted average basis.
------------------------------------------------------------------------------
Change of Control of ATSI  Holder may convert to whatever type of security
                           the common stockholders received in the change of
                           control transaction.
------------------------------------------------------------------------------
Mandatory Redemption       Holder may elect redemption at the greater of (i)
                           $1,250 per share plus 6% per annum plus all
                           default payments and liquidated damages, if any,
                           and (ii) the Parity Value if: ATSI refuses to:
                           honor conversion notice, ATSI fails to obtain an
                           effective registration statement prior to March
                           11, 2001, if bankruptcy proceedings are initiated
                           against ATSI, if the Mexican government limits or
                           terminates the scope of  ATSI's concession or if
                           ATSI fails to maintain a listing on NASDAQ, NYSE
                           or AMEX.
------------------------------------------------------------------------------
Optional Redemption        Subject to certain conditions, at ATSI's option if
                           closing bid price is below $1.3125 and has been
                           for the 20 preceding trading days, at a price
                           equal to $1,150 per share plus 6% per annum plus
                           all default payments and liquidated damages, if
                           any.
------------------------------------------------------------------------------
Liquidated Damages for     If (i) the Registration Statement is not declared
Failure to Meet            effective by February 11, 2001, (ii) sales of the
Registration               ATSI common stock
------------------------------------------------------------------------------

                                       19
<PAGE>

------------------------------------------------------------------------------
Registration               cannot be made pursuant to this registration
                           statement (of which this prospectus is a part) after
                           it is declared effective or (iii) the common stock is
                           not traded on the Nasdaq National Market, the Nasdaq
                           Small Cap Market, the NYSE or the AMEX, ATSI shall
                           pay to each holder an amount equal to $1,000 times
                           .03 times the sum of the number of months that any of
                           the conditions specified above exists.
------------------------------------------------------------------------------
Investment Option          On any conversion date relating to a conversion of
                           the Series E Preferred Stock, the holder has the
                           option to purchase eight tenths (.80) of one
                           additional share of common stock for every share
                           of common stock issuable upon conversion, at an
                           exercise price equal to the conversion price then
                           in effect.
------------------------------------------------------------------------------
Other                      No issuances of common stock that would cause the
                           holder to own more than 4.9% of ATSI's total
                           common stock at any given time;

                           Total issuances of common stock during term of
                           Series E not to exceed 13,590,590 (19.99% of
                           ATSI's total shares outstanding at closing date),
                           without prior stockholder approval;

                           Ten day right of first refusal on issuance of
                           common stock, warrants for common stock, or
                           securities convertible into common stock except
                           for issuance in a firm commitment underwritten
                           public offering, issuances in connection with a
                           merger or acquisition or upon conversion or
                           exercise of outstanding options, warrants or other
                           convertible securities.  For issuances under
                           ATSI's equity line of credit, the right of first
                           refusal is for 15 trading days.
------------------------------------------------------------------------------

  Certain Definitions.

"Fixed Conversion Price" means $ 1.65 per share; provided, however, that if the
Reset Price is lower than the Fixed Conversion Price on the Reset Date, then the
Fixed Conversion Price will be the Reset Price but if ATSI issues or sells
                                               ---
equity securities under its equity line of credit, the Fixed Conversion Price
will be the lowest of (i) the Fixed Conversion Price otherwise in effect, (ii)
the price at which common stock is issued under the equity line or (iii) the
average closing bid price for the common stock during the 10 consecutive trading
days prior to the issuance under the Equity Line.

"Floor Price" means $ 1.24 per share but if the closing bid price of the common
stock is less than $1.24 per share for any 10 trading days during any 20
consecutive trading day period, then the Floor Price will be eliminated.

                                       20
<PAGE>

"Market Price" means the average of the 5 lowest closing bid prices during the
10 consecutive trading dates before the date of a notice of conversion.

"Parity Value" means (i) the product of (x) the highest number of shares of
common stock issuable upon conversion of the Series E Preferred Stock times (y)
the highest closing price for the common stock during the period from the date
that a mandatory redemption event first occurred and ending on the day prior to
the date of the mandatory redemption minus (ii) the aggregate exercise price
payable upon full exercise of investment option described above.

"Reset Price" means the average of the closing bid prices for the lowest 5
consecutive trading days during the 20 consecutive trading day period ending on
the Reset Date.

"Reset Date" means the date which is the later of (i) February 11, 2001 and (ii)
the date the Registration Statement is declared effective by the SEC.

Features of Series A Preferred Stock
------------------------------------

------------------------------------------------------------------------------
                           Series A
------------------------------------------------------------------------------
Shares Outstanding         17,703
------------------------------------------------------------------------------
Amount Paid Per Share      $100
------------------------------------------------------------------------------
Dividends                  10% per annum payable quarterly in arrears
                           beginning June 1, 1999; payable in shares of ATSI
                           common stock

                           participate in distributions to common stock
                           holders as if preferred stock had been converted
                           into common stock on record date for distribution.
------------------------------------------------------------------------------
Dividend Preference        Prior to common stock, ratably with Series D
                           Preferred Stock.
------------------------------------------------------------------------------
Liquidation Preference     Prior to common stock, shares ratably with Series
                           D Preferred Stock; liquidation payment of $100 per
                           share outstanding plus accrued and unpaid
                           dividends.
------------------------------------------------------------------------------
Voting Rights              Votes as if conversion of outstanding shares
                           occurred on record date for vote; majority
                           approval required for significant corporate events
                           such as merger or sale.
------------------------------------------------------------------------------
Conversion Price           Average of closing sale prices for the 20 trading
                           days preceding issuance times $100 per share, plus
                           accrued and unpaid dividends; reset on each
                           anniversary date to greater of 75% of initial
                           conversion price or 75% of 20 day trading average
                           prior to anniversary date.
------------------------------------------------------------------------------
Conversion Time            From date of issuance to February 28, 2005;
                           mandatory conversion on February 28, 2005.
------------------------------------------------------------------------------
Adjustments to             As appropriate in event of stock split, reverse
 Conversion Price          stock split or stock dividend.
------------------------------------------------------------------------------
Change of Control of ATSI  no special provision
------------------------------------------------------------------------------
Mandatory Redemption       N/A
------------------------------------------------------------------------------
Optional Redemption        At ATSI's option after first anniversary of issue
                           date if
------------------------------------------------------------------------------

                                       21
<PAGE>

------------------------------------------------------------------------------
                           market price of common stock is 200% or
                           more of conversion price, for $100 per share plus
                           accrued and unpaid dividends.
------------------------------------------------------------------------------
Trading/                   Restricted, common shares issued on conversion
Conversion Restrictions    restricted with exception of common shares
                           underlying 10,000 shares of Series A which ATSI
                           has agreed to register.

------------------------------------------------------------------------------
Registration Rights        For 10,000 shares issued February 4, 2000
                           registration statement declared effective
                           September 8, 2000.
------------------------------------------------------------------------------
Liquidated Damages for     A total of $50,000  accrued prior to effectiveness
 Failure to Meet           on September 8, 2000.
 Registration Deadlines
------------------------------------------------------------------------------
Other                      N/A
------------------------------------------------------------------------------

Features of Series D Preferred Stock
------------------------------------------------------------------------------
                           Series D
------------------------------------------------------------------------------
Shares Outstanding         3,000
------------------------------------------------------------------------------
Amount Paid Per Share      $1,000
------------------------------------------------------------------------------
Dividends                  6% per annum payable quarterly in arrears,
                           beginning March 31, 2000; payable in cash or
                           registered shares of ATSI common stock, at ATSI's
                           election.
------------------------------------------------------------------------------
Dividend Preference        Prior to common stock, ratably with Series A
                           Preferred Stock.
------------------------------------------------------------------------------
Liquidation Preference     Prior to common stock, ratably with Series A
                           Preferred Stock; liquidation payment of $1,300 per
                           share outstanding plus accrued and unpaid
                           dividends.
------------------------------------------------------------------------------
Voting Rights              None, except as required by Delaware law.
------------------------------------------------------------------------------
Conversion Price           Lesser of $5.4375 or 83% of the average of the
                           lowest 5 closing bid prices for the common stock
                           during the 10 trading days prior to conversion.
------------------------------------------------------------------------------
Conversion Time            Any time after February 22, 2000, except for a
                           single 30 day lock out if common stock price falls
                           below $2.50; mandatory conversion of any remaining
                           shares on February 22, 2002.
------------------------------------------------------------------------------
Adjustments to             Upon notice of stock split,  dividend, or issuance
 Conversion Price          of additional shares at a discount to market,
                           holder may elect to convert based on average
                           closing bid price during five or fewer trading
                           days preceding conversion;

                           If common stock becomes ineligible for trading on
                           OTCBB, AMEX or NASDAQ, conversion price adjusted
                           to 65% of average of five lowest closing bid
                           prices during ten trading days preceding
                           conversion.

                           If ATSI issues common stock, common stock warrants
                           or securities convertible into common stock at a
                           lower price
------------------------------------------------------------------------------

                                       22
<PAGE>

-------------------------------------------------------------------------------
                           than conversion price for Series D Preferred Stock,
                           and agrees to register the common stock, holder's
                           conversion price is adjusted to lowest price for new
                           issuance.
-------------------------------------------------------------------------------
Change of Control of ATSI  holder may elect redemption at 120% of sum of
                           $1,300 per share and accrued and unpaid dividends,
                           or convert to whatever type of security the common
                           stockholders received in the change of control;.
------------------------------------------------------------------------------
Mandatory Redemption       Upon change of control of ATSI, holder may elect
                           redemption at 120% of sum of $1,300 per share and
                           accrued and unpaid dividends,  or convert to
                           whatever type of security the common stockholders
                           received in the change of control;

                           Holder may elect redemption at $1,270 per share
                           plus accrued and unpaid dividends if  ATSI refuses
                           to honor conversion notice or third party brings
                           suit challenging conversion.
------------------------------------------------------------------------------
Optional Redemption        At ATSI's option if price of common stock falls
                           below price at closing date, for $1,270 per share
                           plus accrued but unpaid dividends plus additional
                           warrant for 150,000 shares of common stock  (on
                           same terms as warrant issued to the holder on
                           February 22, 2000).
------------------------------------------------------------------------------
Trading/                   Restricted;  common shares issued on conversion to
Conversion Restrictions    be restricted until registration;

                           one time 30 day lock out if price of common stock
                           is $2.50 or less.
------------------------------------------------------------------------------
Registration Rights        Registration statement declared effective
                           September 8, 2000.
------------------------------------------------------------------------------
Liquidated Damages for     $300,000 accrued before effectiveness on September
 Failure to Meet           8, 2000.
 Registration Deadlines
------------------------------------------------------------------------------
Other                      Ten day right of first refusal on issuance of
                           common stock, warrants for common stock, or
                           securities convertible into common stock for price
                           less than then-current market price, or debt with
                           interest greater than 9.9%.

                           No issuances of common stock that would cause
                           holder to own more than 5% of ATSI's total common
                           stock at any given time;   if 5% limit would be
                           exceeded on mandatory conversion date ATSI may
                           redeem excess shares or extend conversion date for
                           one year.

                           Total issuances of common stock during term of
                           Series D not to exceed 11,509,944 (20% of ATSI's
                           total shares outstanding at closing date);  ATSI
                           must redeem any excess.
------------------------------------------------------------------------------

                                       23
<PAGE>

------------------------------------------------------------------------------
                           May not create new stock having liquidation
                           preference over Series D.
------------------------------------------------------------------------------


Provisions having possible anti-takeover effects

     The ATSI Certificate of Incorporation and the ATSI Bylaws contain
provisions that could have an anti-takeover effect. These provisions are
intended to enhance the likelihood of continuity and stability in the
composition of the Board of Directors and in the policies formulated by the
Board of Directors and to discourage certain types of transactions which may
involve an actual or threatened change of control of ATSI. The provisions are
designed to reduce the vulnerability of ATSI to an unsolicited proposal for a
takeover of ATSI that does not contemplate the acquisition of all of its
outstanding shares or an unsolicited proposal for the restructuring or sale of
all or part of ATSI. The provisions are also intended to discourage certain
tactics that may be used in proxy contests. Set forth below is a description of
such provisions in the ATSI Certificate and the ATSI Bylaws.

     Pursuant to the ATSI Certificate, directors, other than those, if any,
elected by the holders of preferred stock, can be removed from office by the
affirmative vote of the holders of preferred stock, owning 66 2/3% of the voting
power of the then outstanding shares of capital stock entitled to vote thereon
("Voting Stock"). Vacancies on the Board of Directors may be filled by the
remaining directors without stockholder approval.

     The ATSI Certificate provides for the Board of Directors to be divided into
three classes, with staggered three-year terms.  As a result, only one class of
directors will be elected at each annual meeting of stockholders of ATSI, with
the other classes continuing for the remainder of their respective three-year
term.  The classification of the Board of Directors makes it more difficult to
replace the Board of Directors as well as for another party to obtain control of
ATSI by replacing the Board of Directors.  Since the Board of Directors has the
power to retain and discharge officers of ATSI, these provisions could also make
it more difficult for existing stockholders or another party to effect a change
in management.

     The ATSI Certificate provides that except as otherwise provided for with
respect to the rights of holders of preferred stock, no action that is required
or permitted to be taken by the stockholders of ATSI at any annual or special
meeting of the stockholders may be effected by written consent of the
stockholders in lieu of a meeting of stockholders, unless the action by such
written consent has been expressly approved in advance by the Board of
Directors.  This provision makes it difficult for stockholders to initiate or
effect an action by written consent, and thereby effect an action opposed by the
Board of Directors.  The ATSI Certificate and ATSI Bylaws also provide that
special meetings of stockholders may be called only by the President or a
majority of the Board of Directors of ATSI.  In addition, the ATSI Bylaws set
forth an advance notice procedure with regard to business to be brought before
an annual meeting of stockholders of ATSI.

  The ATSI Certificate further provides that the Board of Directors, by a
majority vote, may adopt, alter, amend or repeal provisions of the ATSI Bylaws.
However, stockholders may only adopt, alter, amend or repeal provisions of the
ATSI Bylaws by a vote of 66 2/3% or more

                                       24
<PAGE>

of the combined voting power of the then outstanding Voting Stock. In addition,
the ATSI Certificate provides that whenever any vote of voting stock is required
by law to amend, alter, repeal or rescind ("Change") any provision thereof,
then, in addition to any affirmative vote required by law the affirmative vote
of 66 2/3% or more of the combined voting power of the then outstanding shares
of Voting Stock is required to Change certain provisions of the ATSI
Certificate, including the provisions referred to above relating to interested
stockholder transactions, the filling of vacancies on the Board of Directors,
the removal of directors, the limitations on stockholders and the approval of
amendments to the ATSI Bylaws.

                                USE OF PROCEEDS

     The selling stockholders will receive the proceeds from the shares of
common stock.  We will not receive any of the proceeds.

                              COMMON STOCK ISSUED


     The common stock offered by this prospectus has been or may be issued to
the selling stockholders pursuant to the terms of the following securities:

  .  up to 6,060,606 shares of common stock that may be issued upon the
     conversion of 2,500 shares of our Series E Preferred Stock issued to RGC
     International Investors, LDC on October 13, 2000 (the "First Closing") and
     the conversion of 7,500 shares of our Series E Preferred Stock to be issued
     to RGC International Investors, LDC (the "Second Closing"), based upon an
     initial conversion price of $1.65. The actual number of shares issued may
     be materially higher. You should read the material under "Our Capital
     Stock -Features of Series E Preferred Stock" for more information on how
     the conversion price is calculated.

  .  3,636,364 shares of common stock that may be issued upon the exercise of
     warrants issued to RGC International Investors, LDS at an exercise price of
     $1.72.

  .  75,000 shares of common stock that may be issued upon the exercise of
     warrants issued to Jesup & Lamont Securities Corporation at an exercise
     price of $7.17.

  .  100,000 shares of common stock that may be issued upon the exercise of
     warrants issued to Binkley LLC at an exercise price of $7.17.

     The terms of our various preferred stock issuances include many potentially
adverse effects for us and our stockholders as described in the Risk Factors
section of this prospectus.  However, as described in our risk factor captioned,
"If we do not raise additional capital, we may go out of business," we are not
able to raise funds on terms as favorable as those available to profitable
companies.  At the time these issuances were made, we needed funds to continue
operations and were not able to find financing on more favorable terms.  Our
Board of Directors believed it to be in the best interest of the stockholders to
raise the funds needed to continue operations.

                                       25
<PAGE>

     You should carefully review this information and the discussion in the Risk
Factors section describing the risks arising from the uncertainty regarding the
number of shares that may be issued and the potential dilution to your ownership
of our common stock.

                             SELLING STOCKHOLDERS

     The name of the selling stockholders, the amount of common stock owned is
as of November 10, 2000, the maximum amount of common stock that may be offered
under this registration statement (of which this prospectus is a part), and the
percentage ownership in ATSI upon completion of the offering is shown in the
table below.

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------
                             Amount of
                              Common
                               Stock          Maximum        Amount of     % of Common
                            Beneficially      Amount of     Common Stock   Stock Owned
                            Owned as of        Common        Owned upon      upon
                            November 10,    Stock that may   completion    completion
Name                            2000          be Offered     of offering   of offering
--------------------------------------------------------------------------------------
<S>                         <C>             <C>             <C>            <C>
Jesup & Lamont
Securities Corporation         75,000(1)       75,000 (1)              0             0%
--------------------------------------------------------------------------------------
Binkley LLC                   100,000(2)      100,000 (2)              0             0%
--------------------------------------------------------------------------------------
RGC International
Investors, LDC             19,393,940(3)   19,393,940 (3)              0             0%

--------------------------------------------------------------------------------------
</TABLE>

  (1) The amount of shares listed in the table as the amount beneficially owned
  and the maximum amount of common stock that may be offered by Binkley LLC
  represent the number of shares that they may purchase upon the exercise of
  warrants issued as a finder's fee in connection with our equity line of
  credit.

  (2) The amount of shares listed in the table as the amount beneficially owned
  and the maximum amount of common stock that may be offered by Jesup & Lamont
  Securities Corporation represent the number of shares that they may purchase
  upon the exercise of warrants issued as a finder's fee in connection with our
  equity line of credit.

  (3) The number of shares set forth in the table for RGC International
  Investors represents an estimate of the number of shares of common stock to be
  offered by RGC International Investors. The actual number of shares of common
  stock issuable upon conversion of the Series E Preferred Stock and exercise of
  the related warrants is indeterminate, is subject to adjustment and could be
  materially less or more than such estimated number depending on factors which
  cannot be predicted by us at this time, including, among other factors, the
  future market price of the common stock. The actual number of shares of common
  stock offered in this prospectus, and included in the registration statement
  of which this prospectus is a part, includes such additional number of shares
  of common stock as may be issued or issuable upon conversion of the Series E
  Preferred Stock and exercise of the related warrants by reason of any stock
  split, stock dividend or similar transaction involving the common

                                       26
<PAGE>

  stock, in accordance with Rule 416 under the Securities Act. Under the terms
  of the Series E Preferred Stock, if the Series E Preferred Stock had been
  actually converted on November 10, 2000, the conversion price would have been
  $1.65, which is 120% of the closing bid price on October 12, 2000, at which
  price the Series E Preferred Stock would have been converted into
  approximately 6,060,606 shares of common stock. The warrants issued in
  connection with the Series E Preferred Stock are exercisable into 3,636,364
  shares of common stock at an exercise price of $1.72.

  Under the terms of the Series E Preferred Stock and the related warrants, the
  shares of Series E Preferred Stock are convertible and the warrants are
  exercisable by any holder only to the extent that the number of shares of
  common stock issuable pursuant to such securities, together with the number of
  shares of common stock owned by such holder and its affiliates (but not
  including shares of common stock underlying unconverted shares of Series E
  Preferred Stock or unexercised portions of the warrants) would not exceed 4.9%
  of the then outstanding common stock as determined in accordance with Section
  13(d) of the Exchange Act. Accordingly, the number of shares of common stock
  set forth in the table for RGC International Investors exceeds the number of
  shares of common stock that RGC International Investors could own beneficially
  at any given time through their ownership of the Series E Preferred Stock and
  the warrants. In that regard, the beneficial ownership of the common stock by
  RGC International Investors set forth in the table is not determined in
  accordance with Rule 13d-3 under the Exchange Act.

                             PLAN OF DISTRIBUTION

     The shares being offered by the selling stockholders or their respective
pledgees, donees, transferees or other successors in interest, will be sold from
time to time in one or more transactions (which may involve block transactions):

     .    on the American Stock Exchange or on such other market on which the
          common stock may from time to time be trading;

     .    in privately-negotiated transactions;

     .    through the writing of options on the shares;

     .    short sales; or

     .    any combination thereof.

     The sale price to the public may be:

     .    the market price prevailing at the time of sale;

     .    a price related to such prevailing market price;

     .    at negotiated prices; or

                                       27
<PAGE>

     .    such other price as the selling stockholders determine from time to
          time.

The shares may also be sold pursuant to Rule 144. The selling stockholders shall
have the sole and absolute discretion not to accept any purchase offer or make
any sale of shares if they deem the purchase price to be unsatisfactory at any
particular time.

     The selling stockholders or their respective pledgees, donees, transferees
or other successors in interest, may also sell the shares directly to market
makers acting as principals and/or broker-dealers acting as agents for
themselves or their customers. Such broker-dealers may receive compensation in
the form of discounts, concessions or commissions from the selling stockholders
and/or the purchasers of shares for whom such broker-dealers may act as agents
or to whom they sell as principal or both, which compensation as to a particular
broker-dealer might be in excess of customary commissions. Market makers and
block purchasers purchasing the shares will do so for their own account and at
their own risk. It is possible that a selling stockholder will attempt to sell
shares of common stock in block transactions to market makers or other
purchasers at a price per share which may be below the then market price. The
selling stockholders cannot assure that all or any of the shares offered in this
prospectus will be issued to, or sold by, the selling stockholders. The selling
stockholders and any brokers, dealers or agents, upon effecting the sale of any
of the shares offered in this prospectus, may be deemed "underwriters" as that
term is defined under the Securities Act or the Exchange Act, or the rules and
regulations under such acts.

     The selling stockholders, alternatively, may sell all or any part of the
shares offered in this prospectus through an underwriter. No selling stockholder
has entered into any agreement with a prospective underwriter and there is no
assurance that any such agreement will be entered into. If a selling stockholder
enters into such an agreement or agreements, the relevant details will be set
forth in a supplement or revisions to this prospectus.

     The selling stockholders and any other persons participating in the sale or
distribution of the shares will be subject to applicable provisions of the
Exchange Act and the rules and regulations under such act, including, without
limitation, Regulation M. These provisions may restrict certain activities of,
and limit the timing of purchases and sales of any of the shares by, the selling
stockholders or any other such person. Furthermore, under Regulation M, persons
engaged in a distribution of securities are prohibited form simultaneously
engaging in market making and certain other activities with respect to such
securities for a specified period of time prior to the commencement of such
distributions, subject to specified exceptions or exemptions. All of these
limitations may affect the marketability of the shares.

     We have agreed to indemnify the selling stockholders, or their transferees
or assignees, against certain liabilities, including liabilities under the
Securities Act, or to contribute to payments the selling stockholders or their
respective pledgees, donees, transferees or other successors in interest, may be
required to make in respect of such liabilities."

                                       28
<PAGE>

                                 LEGAL MATTERS

     The validity of the shares of common stock offered hereby is being passed
upon by Raymond G. Romero, San Antonio, Texas. Mr. Romero is ATSI's General
Counsel and is an employee.

                                    EXPERTS

     The financial statements and schedules incorporated by reference in this
prospectus and elsewhere in the registration statement have been audited by
Arthur Andersen LLP, independent public accountants, as indicated in their
reports with respect thereto, and are included herein in reliance upon the
authority of said firm as experts in accounting and auditing in giving said
reports.

     Reference is made to said reports, which include an explanatory paragraph
with respect to the uncertainty regarding the Company's ability to continue as a
going concern as discussed in Note 2 to the financial statements.

                      WHERE YOU CAN FIND MORE INFORMATION

     Government Filings. We file annual, quarterly and special reports, proxy
statements and other information with the Securities and Exchange Commission
(the "SEC"). You may read and copy any document we file at the SEC's public
reference rooms in Washington, D.C., New York, New York, and Chicago, Illinois.
The SEC public reference room in Washington D.C. is located at 450 Fifth Street,
N.W., Washington D.C., 20549. Please call the SEC at 1-800-SEC-0330 for further
information on the pubic reference rooms. Our SEC filings are also available to
you free of charge at the SEC's web site at http://www.sec.gov.
                                            -------------------

     Information Incorporated by Reference. The SEC allows us to "incorporate by
reference" the information we file with them, which means that we can disclose
important information to you by referring you to those documents. The
information incorporated by reference is considered to be part of this
prospectus, and later information that we file with the SEC will automatically
update and replace information previously filed, including information contained
in this prospectus.

  We incorporate by reference the documents listed below and any future filings
made with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Securities
Exchange Act of 1934 until this offering has been completed.

 .    Our Annual Report on Form 10-K for the year ended July 31, 2000;
 .    Our current report on Form 8-K dated October 19, 2000;
 .    Our wholly-owned subsidiary GlobalSCAPE's Quarterly Report on Form 10-Q for
     the quarter ended June 30, 2000

You may request a free copy of these filings by writing or telephoning us at the
following address:

                                       29
<PAGE>

     American TeleSource International, Inc.
     Investor Relations
     6000 Northwest Parkway
     San Antonio, Texas 78249
     (210) 547-1000.

We will not send exhibits to these documents unless the exhibits are
specifically incorporated by reference in this document.

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following are the expenses (estimated except for the SEC registration
fee) for the issuance and distribution of the securities being registered, all
of which will be paid by ATSI:

     SEC Registration     $ 6,309.30
     Legal                $ 5,000.00
     Printing             $ 5,000.00
     Miscellaneous            500.00
                          ----------

            Total:        $16,809.30

ATSI will not pay commissions and discounts of underwriters, dealers or agents,
if any, or any transfer taxes.

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

As permitted by Section 145 of the Delaware General Corporation Law, ATSI's
Amended and Restated Certificate of Incorporation includes a provision that
eliminates the personal liability of its directors for monetary damages for
breach or alleged breach of their duty of care. In addition, the DGCL and ATSI's
Bylaws provide for indemnification of ATSI's directors and officers for certain
liabilities and expenses that they may incur in such capacities. In general,
directors and officers are indemnified with respect to actions taken in good
faith in a manner reasonably believed to be in, or not opposed to, the best
interests of ATSI, and with respect to any criminal action or proceeding,
actions that the indemnitee had no reasonable cause to believe were unlawful.

     ATSI has purchased insurance with respect to, among other things; the
liabilities that may arise under the provisions referred to above. The directors
and officers of ATSI are also insured against liabilities, including liabilities
arising under the Securities act of 1933, as amended, which might be incurred by
them in their capacities as directors and officers of ATSI and against which
they are not indemnified by ATSI.

                                       30
<PAGE>

     In connection with this offering, RGC International Investors, LDC (or its
assignees under a Registration Rights Agreement signed by ATSI and RGC
International Investors, LDC) has agreed to indemnify ATSI, and its officers,
directors and controlling persons, against any losses, claims, damages or
liabilities to which they may become subject that arise out of or are based upon
an untrue statement or alleged untrue statement of a material fact contained in
this prospectus or the Registration statement any omission or alleged omission
to state in this prospectus or the Registration statement material fact required
to be stated or necessary to make the statements in this prospectus or the
Registration statement not misleading, to the extent that such statement or
omission was made in reliance on the written information furnished to ATSI by
RGC International Investors, LDC.

ITEM 16.   EXHIBITS.

4.1  Securities Purchase Agreement between American TeleSource International,
     Inc. (ATSI) and RGC International Investors, LDC dated October 11, 2000
     (Exhibit 10.1 to Form 8-K filed on October 18, 2000)
4.2  Certificate of Designation, Preferences and Rights of 6% Series E
     Cumulative Convertible Preferred Stock (Exhibit 10.2 to Form 8-K filed on
     October 18, 2000)
4.3  Certificate of Correction of Certificate of Designation, Preferences and
     Rights of 6% Series E Cumulative Convertible Preferred Stock (Exhibit 10.3
     to Form 8-K filed on October 18, 2000)
4.4  2nd Certificate of Correction of Certificate of Designation, Preferences
     and Rights of 6% Series E Cumulative Convertible Preferred Stock (Exhibit
     10.4 to Form 8-K filed on October 18, 2000)
4.5  Registration Rights Agreement between American TeleSource International,
     Inc. and RGC International Investors, LDC (Exhibit 10.5 to Form 8-K filed
     on October 18, 2000)
4.6  Securities Purchase Warrant between American TeleSource International, Inc.
     and RGC International Investors, LDC (Exhibit 10.6 to Form 8-K filed on
     October 18, 2000)
4.7  Securities Purchase Warrant between American TeleSource International, Inc.
     and Jesup and Lamont Securities Corporation (Exhibit to this Registration
     statement on Form S-3 filed November 15, 2000)
4.8  Securities Purchase Warrant between American TeleSource International, Inc.
     and Binkley LLC (Exhibit to this Registration Statement on Form S-3 filed
     November 15, 2000)
5.1  Opinion of Raymond G. Romero (Exhibit to this Registration statement on
     Form S-3 filed November 15, 2000)
23   Consent of Arthur Andersen LLP (Exhibit to this Registration statement on
     Form S-3 filed November 15, 2000)
24   Power of Attorney (included on signature page to the Registration
     statement)

ITEM 17.  UNDERTAKINGS

The undersigned registrant hereby undertakes:

                                       31
<PAGE>

     A. Undertakings Regarding Amendments to this Prospectus and the
     Registration statement

     1. To file, during any period in which offers or sales are being made, a
     post-effective amendment to this Registration statement:

          (i)   To include any prospectus required by section 10(a)(3) of the
     Securities Act of 1933;


          (ii)  To reflect in the prospectus any facts or events arising after
     the effective date of the Registration statement (or the most recent post-
     effective amendment thereof) which, individually or in the aggregate,
     represent a fundamental change in the information set forth in the
     Registration statement. Notwithstanding the foregoing, any increase or
     decrease in volume of securities offered (if the total dollar value of
     securities offered would not exceed that which was registered) and any
     deviation from the low or high end of the estimated maximum offering range
     may be reflected in the form of prospectus filed with the SEC pursuant to
     Rule 424(b) if, in the aggregate, the changes in volume and price represent
     no more than a 20% change in the maximum aggregate offering price set forth
     in the "Calculation of Registration Fee" in the effective Registration
     statement; and

          (iii) To include any material information with respect to the plan of
     distribution not previously disclosed in the Registration statement or any
     material change to such information in the Registration statement.

     Provided, however, that the undertakings set forth in paragraphs (1)(A)(i)
     and (ii) of this section do not apply if the information required to be
     included in a post-effective amendment by those paragraphs is contained in
     periodic reports filed by ATSI pursuant to Section 13 or Section 15(d) of
     the Securities Exchange Act of 1934 that are incorporated by reference in
     this Registration statement.

     2.   That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     3.   To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.

     B.   Undertaking Regarding Filings Incorporating Subsequent Exchange Act
Documents by Reference. ATSI hereby undertakes that, for purposes of determining
any liability under the Securities Act of 1933, each filing of ATSI's Annual
Report on Form 10-K pursuant to section 13(a) or section 15(d) of the Securities
Exchange Act of 1934 (and, where applicable, each filing of any employee benefit
plan's annual report pursuant to section 15(d) of the Securities Exchange Act of
1934) that is incorporated by reference in this Registration statement shall be
deemed to be a new registration statement relating to the securities offered

                                       32
<PAGE>

therein, and the offering of such securities at that time shall be deemed to be
the initial bona fide offering thereof.

     C.  Undertaking in Respect of Indemnification. Insofar as indemnification
for liabilities arising under the Securities Act of 1933 (the "Act") may be
permitted to directors, officers and controlling person of ATSI pursuant to the
foregoing provisions, or otherwise, we have been advised that in the opinion of
the Commission such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by ATSI of
expenses incurred or paid by a director, officer or controlling person of ATSI
in the successful defense of any action, suit or proceeding) is asserted by such
director, officer or controlling person in connection with the securities being
registered, the registrant will, unless in the opinion of its counsel the matter
has been settled by controlling precedent, submit to a court of appropriate
jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Act and will be governed by the final adjudication of
such issue.

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this Registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the city of San Antonio, State of Texas on the 15th day of
November 2000.

                                   AMERICAN TELESOURCE INTERNATIONAL, INC.

                                   By: /s/  H. Douglas Saathoff
                                       ------------------------
                                       H. Douglas Saathoff
                                       Chief Financial Officer
                                       (Duly authorized officer)

                                       POWER OF ATTORNEY

     Each person whose signature appears below constitutes and appoints H.
Douglas Saathoff as attorney-in-fact, with the power of substitution, for him in
any and all capacities, to sign this Registration statement and any amendments
to this Registration statement and to file the same, with exhibits thereto and
other documents in connection therewith, with the SEC, granting to said attorney
in-fact full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection therewith, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorney-in-fact, or his substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.

     In witness whereof, each of the undersigned has executed this Power of
Attorney as of the date indicted.

                                       33
<PAGE>

     Pursuant to the requirements of the Securities Act of 1933, this
Registration statement has been signed by the following persons in the
capacities and on the date indicated.


/s/ Arthur L. Smith        Chairman of the Board of Directors  November 15, 2000
------------------------
Arthur L. Smith            Chief Executive Officer
                           Director
                           (Principal Executive Officer)

/s/ H. Douglas Saathoff    Chief Financial Officer             November 15, 2000
------------------------
H. Douglas Saathoff        Senior Executive Vice President
                           Treasurer
                           (Principal Accounting and Financial
                            Officer)

/s/Richard C. Benkendorf   Director                            November 15, 2000
------------------------
Richard C. Benkendorf

/s/Carlos K. Kauachi       Director                            November 15, 2000
------------------------
Carlos K. Kauachi

/s/ Murray R. Nye          Director                            November 15, 2000
------------------------
Murray R. Nye

/s/ Tomas Revesz           Director                            November 15, 2000
------------------------
Tomas Revesz

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