European Competitive Telecommunications Association

WESTFORD, Mass., March, 31, 2009 - Sonus Networks, (Nasdaq: SONS), providing network transformation through IP communications technology, today announced that they are the latest member to join the VoLGA Forum (Voice over LTE Generic Access) and has developed a strategy for supporting mobile operators in the migration to Long Term Evolution (LTE). The overall architecture, known as Sonus MobilEvolution, combines Sonus IP-Voice and Multimedia SIP core network technology with the Sonus MobilEdge wireless access node for IP-based radio access. This enables the delivery of basic voice and SMS services from the circuit core even when using the all IP LTE radio access network, and will allow operators to build a richer communications experience to end-users through voice and multimedia.

Sonus MobilEvolution architecture supports joint interworking of packet and circuit-switched network elements, enabling mobile network operators to initially combine a circuit-switched core network for legacy services with an IP-based access and core network for multimedia services. The Sonus MobilEdge can be used as a VANC (VoLGA Access Network Controller) as defined through the VoLGA forum. The VoLGA forum has been set up to facilitate the delivery of voice and SMS services within the LTE environment from initial development.

“Long-Term Evolution (LTE) is gaining momentum as operators are looking to use LTE as a means of providing fixed broadband services to rural markets and in some cases, to offer fixed broadband outside of their operating territory. LTE has the advantage of essentially unifying mobile technologies into a single standard that has global reach, allowing for greater flexibility, stronger ecosystem, cost reductions and competitiveness. However, delivering existing voice and SMS services for users in this environment is a key challenge that needs to be addressed, so mobile operators can maintain valued services and avoid becoming simple bit pipe providers.” commented Teresa Mastrangelo, analyst at

 “With 12 years of experience in transforming networks to realize the benefits of IP, Sonus is now taking the next step to enable mobile operators migrate seamlessly and rapidly to LTE,” commented Shailin Sehgal, vice president marketing and product management at Sonus Networks. “Users will benefit from a rich communication suite (RCS) of services, adding presence, IM, chat, video and content transfer to the basic voice communications experience.” 

About VoLGA
The VoLGA Forum was initiated to specify and promote an approach for extending traditional GSM and UMTS circuit-switched services over LTE access networks.

Based on the existing 3GPP Generic Access Network (GAN) standard, VoLGA technology will enable mobile subscribers to receive a consistent set of voice, SMS (and other circuit-switched) services as they transition between GSM, UMTS and LTE access networks. For mobile operators, VoLGA represents a low-cost, low-risk approach for bringing their primary revenue generating services (voice and SMS) to their upcoming LTE access network deployments.

To promote the widespread adoption of VoLGA technology, VoLGA Forum participants are currently developing a set of open specifications and may be used by vendors and operators of wireless communications systems and applications to develop and deploy interoperable solutions.

About Sonus Networks
Sonus Networks Inc., providing network transformation through IP communications technology, is leading the evolution of communications networks to support the multi-media, multi-device demands of today’s digital lifestyle. Sonus solutions and services enable fixed, mobile and cable operators to gain network awareness and new multi-media capabilities essential to retaining and expanding their subscriber base. Through standards based interoperable solutions and services, Sonus extends the investments made in traditional networks by enabling operators to seamlessly migrate to next generation technology and deliver the secure, reliable, scalable and cost-effective network needed to grow their business. For more information visit


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