WESTFORD, Mass. -- Sonus Networks, Inc. (Nasdaq: SONS - News), a leading supplier of service provider Voice over IP (VoIP) infrastructure solutions, announced today that with the latest release of its award-winning IP Multimedia Subsystem (IMS)-ready core infrastructure solutions, the Sonus platform now supports the newly standardized method to provide both Local Number Portability (LNP) and Mobile Number Portability (MNP) services for Japanese network operators.

Under recent regulation, LNP service with the new method will start by NTT and many other Japanese network operators from February 2007, which will enable Japanese consumers to select their preferred network provider, while keeping their existing phone number. With more than a 75% market share position in Japan, according to Synergy Research Group, Sonus allows operators to comply with this new regulation through a software upgrade.

"LNP and MNP are critical to allowing consumers to choose their provider and to creating a healthy, competitive market for network operators. Sonus Networks is committed to helping operators in the region comply with the new legislation seamlessly and efficiently," said Hassan Ahmed, chairman and CEO, Sonus Networks. "The ability to change providers while retaining your existing phone number is an important driver for innovation, and consumers now have the flexibility to pick the type of service that's tailored to their specific needs."

Sonus Networks Inc. (Nasdaq: SONS)