WESTFORD, Mass. -- Sonus Networks, Inc. (Nasdaq: SONS), a global leader in SIP communications, today announced that Switzerland-based competitive operator Calltrade Carrier Services AG is using the Sonus SBC 5000 Series of Session Border Controllers as part of its wholesale voice over Internet Protocol (VoIP) service. The Sonus SBCs are being deployed at Calltrade interconnect borders - demarcation points where two networks meet - to secure the network borders as well as monitor and enforce service levels.

As an international communications provider, Calltrade terminates more than 15 billion minutes of voice traffic per year for fixed-line providers, mobile phone companies and cable companies worldwide. Calltrade is networked with more than 150 telecommunications carriers across the globe, including nearly all of the world's leading international carriers. To support Calltrade's global footprint, the Sonus SBC 5200 Series delivers advanced media services and protocol interworking to ensure seamless interoperability with other service providers.

The SBC 5200 Series supports up to 64,000 sessions on a single server and provides advanced routing and integrated transcoding capability. As the number and variety of devices connecting to the network increase, the SBC 5200 Series acts as a VoIP translator in the Calltrade network, ensuring that two devices with different codecs communicate properly. In addition, the Sonus SBCs enable high quality of service levels by adjusting bandwidth as voice, video and data cross the Calltrade network to ensure calls or sessions are completed without performance issues. Ensuring interoperability with other services, devices and endpoints on the network helps Calltrade increase revenues by offering interconnect, transcoding and advanced routing services to customers and partners worldwide.

Sonus Networks Inc. (Nasdaq: SONS)