Sonus Networks, Inc., a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced that Synergy Research Group, a leading independent industry analysis firm, has named Sonus Networks the market share leader in high density media gateways, a key component in Sonus' award winning IP Multimedia Subsystem (IMS)-ready architecture. With 30% of the market in Q1 2006, Sonus is leading the world's migration to IP-based voice with carrier-class solutions that offer service providers greater operating efficiency and end users access to a broad range of new communications services.

"Sonus is focused on driving the penetration of IMS-ready solutions in markets around the world. Our customers are some of the most recognized brands in the communications industry, and they rely on us every day to deliver robust solutions and exceptional service," said Hassan Ahmed, chairman and CEO, Sonus Networks. "We're proud to be the number one market share leader in this important category as it underscores our ability to execute on our strategic vision for transforming the world's communication networks."

"Sonus' strong performance in Q1 is reflective of the key role the company has played in helping service providers migrate their networks to VoIP," said Jeremy Duke, president and CEO, Synergy Research Group. "From the Company's inception, Sonus has been solely focused on delivering some of the industry's most sophisticated IP-based voice technologies, and their market leadership this quarter is reflective of the strength of their solutions and the success of their go-to-market strategy."

For a copy of the Synergy Research Group Report, entitled "1Q06 Service Provider Worldwide VoIP Market Share Report," please contact Heather M. Wilson, Synergy Research Group, Inc., hwilson@srgresearch.com.