<PAGE>
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 8-K
Current Report
Pursuant to Section 13 or 15 (d) of
The Securities Exchange Act of 1934
Date of Report (Date of earliest event reported):
October 5, 2000
Natural MicroSystems Corporation
-------------------------------------------------------------------------------
(Exact Name of Registrant as Specified in its Chapter)
Delaware
-------------------------------------------------------------------------------
(State of Incorporation or Organization)
0-23282 04-2814586
-------------------------------------------------------------------------------
(Commission File Number) (I.R.S. Employer Identification No.)
100 Crossing Boulevard, Framingham, Massachusetts 01760
-------------------------------------------------------------------------------
(Address of Principal Executive Offices) (Zip Code)
(508) 620-9300
-------------------------------------------------------------------------------
(Registrant's telephone number, including area code)
Item 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS.
(c) EXHIBITS
4.1 Form of Supplemental Indenture to the Indenture by
and between Natural MicroSystems Corporation and
State Street Bank and Trust Company.
23.1 Consent of Ernst & Young LLP.
23.2 Consent of Rochon Legault.
<PAGE>
SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934,
the Registrant has duly caused this report to be signed on its half by the
undersigned hereto duly authorized.
Natural MicroSystems Corporation
September 25, 2000 By:
--------------------------------
Robert E. Hult
Senior Vice President of
Finance and Operations,
Chief Financial Officer and
Treasurer