Centralized Session Initiation Protocol (SIP) policy and routing for Sonus' industry-leading session border control, session management and softswitch solutions is made possible by the PSX. The "gold standard" of network policy and routing management devices provides 99.999% reliability in the world's most demanding environments and scalability to millions of subscribers packaged in a unique, centralized architecture. Meet the industry's most feature-rich policy and routing server. Superior Technology has its Benefits: - Manage communications sessions routing paths, priority, admission control, etc. - based on policies including media type, source/destination, and time of day/week - Bring together multi-vendor environments to create centralized dial plans and call routing - Advanced Features -- SCPLookups, Overload Controls and Network Traffic Management Experience routing analysis enabling toll-free routing, least-cost routing, number portability, voice VPN, SIP trunking, emergency services and a host of additional high-value capabilities with the Sonus PSX.