Sonus Networks announces voice infrastructure systems agreement with Level 3

Aug. 9, 2001--Sonus Networks nnounced that Level 3 Communications, Inc. hs signed an agreement to purchase network architecture systems designed to support Level 3's wholesale IP voice service.

Sonus Networks (Nasdaq: SONS) announced that Level 3 Communications, Inc. (Nasdaq:LVLT) has signed an agreement to purchase network architecture systems designed to support Level 3's wholesale IP voice service.

Under the terms of the multi-year agreement, Level 3 plans to deploy a range of Sonus' voice infrastructure solutions, including the GSX9000 Open Services Switch, the PSX6000 SoftSwitch and the SGX2000 SS7 Signaling Gateway. Level 3 expects to deploy the Sonus voice infrastructure systems throughout its 16,000-mile U.S. fiber optic network.

About Sonus Networks:

Sonus Networks, Inc. is a provider of voice infrastructure products for the new public network. For more information, visit www.sonusnet.com.

About Level 3 Communications:

Level 3 (Nasdaq:LVLT) is a global communications and information services company offering IP services, broadband transport, colocation services and Softswitch based services. For more information, visit www.Level3.com.

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