Natural MicroSystems Corporation

ITEM 11

Executive Compensation

The information appearing under the caption “Executive Compensation” (other than the information appearing under the captions “Compensation Committee Report on Executive Compensation” and “Comparison of Cumulative Total Stockholder Return”) of the Company’s Proxy Statement for its Annual Meeting of Stockholders to be held April 28, 2000 is incorporated herein by reference.

ITEM 12

Security Ownership of Certain Beneficial Owners and Management

The information appearing under the caption “Stock Ownership of Directors, Executive Officers and Principal Stockholders” of the Company’s Proxy Statement for its Annual Meeting of Stockholders to be held April 28, 2000 is incorporated herein by reference.

ITEM 13

Certain Relationships and Related Transactions

The information appearing under the caption “Certain Relationships and Related Transactions” of the Company’s Proxy Statement for is Annual Meeting of Stockholders to be held April 28, 2000 is incorporated herein by reference.