REVOLUTION PARTNERS ADVISES LINGUATEQ

On July 31, 2001, Sonus Networks, Inc. (Nasdaq: SONS), completed the purchase of certain intellectual property and other assets of privately-held Linguateq Incorporated, a Delaware corporation, headquartered in McLean, Virginia. Revolution Partners, LLC acted as exclusive financial advisor to Linguateq. Linguateq is a provider of data distribution and billing application software for both next generation and legacy networks. Linguateq's patented technology interoperates with a variety of hardware and software platforms and is designed to reduce back office integration time and provide rapid introduction of new services and lower maintenance costs.

Sonus purchased these assets from Linquateq and its secured creditors in exchange for 221,753 shares of Sonus common stock and approximately $225,000 in cash. Pursuant to a registration rights agreement entered into by Sonus, Linguateq and these creditors, Sonus has agreed to register the resale of these shares by such parties under the Securities Act of 1933.

Sonus has employed some of the former employees of Linguateq, including Michael Peterson, founder and chief technology officer and will maintain an office in Virginia.