Sonus Networks, Inc. provides voice infrastructure solutions for wireline and wireless service providers. Its products are infrastructure equipment and software that enable voice services to be delivered over Internet protocol (IP) packet-based networks and are built on the distributed, IP-based principles embraced by the IP Multimedia Subsystem (IMS) architecture. The company’s IMS-based solution product suite includes GSX9000 Open Services Switch to enable voice traffic to be transported over packet networks; GSX4000 Open Services Switch that delivers carrier-class functionality and manageability; PSX Call Routing Server to provide network intelligence, such as call control, service selection, and routing; and SGX Signaling Gateway that provides SS7 solution for its IMS architecture that interconnects packet solutions with SS7 networks. Sonus also offers ASX Feature Server to provide local area calling features for residential and enterprise markets; Network Border Switch that provides IP-to-IP border control and PSTN media gateway integrating security, session control, and media control; IMX Application Platform to develop, integrate, launch, and manage telecommunication applications and services; and Insight Management System to operate carrier-class packet voice networks. Further, it offers global system for mobile communications infrastructure solutions; and network installation, system integration and testing, technical support, and educational services on the installation, operation, and maintenance of its equipment. Sonus’ customers include long distance and local exchange carriers, Internet service providers, wireless operators, cable operators, international telephone companies, and carriers that provide services to other carriers. The company sells its products in the United States, Europe, the Middle East, Africa, Japan, and Asia-Pacific. Sonus was founded in 1997 and is headquartered in Westford, Massachusetts.