SIP Express Router (SER) is a high-performance, configurable, free SIP ( RFC3261 ) server . SER or SIP Express Router is a very fast and flexible SIP server. It handles thousands of calls per second on low-budget hadware. A C shell-like scripting language provides full control over the server's behavior. Its modular architecture lets users load only the required functionality. It can act as registrar, proxy or redirect server. SER features an application-server interface, presence support, SMS gateway, SIMPLE2Jabber gateway, RADIUS/syslog accounting and authorization, server status monitoring, voice mail, offline message service, user call preferences (CPL) etc.

Its performance allows it to deal with operational burdens, such as broken network components, attacks, power-up reboots and rapidly growing user population. SER is written in C and has been ported to Linux (PC and IPAQ) and Solaris (Sun). Throughput is thousands of calls per second (CPS) on a dual-CPU PC (capacity needed to cover Bay Area), and hundreds of CPS on Compaq IPAQ. Support for both IPv4 and IPv6. Footprint is small, on the order of 300KB core, all common modules (optional) up to 630KB. SER has been extensively and successfully tested with many SIP products from other vendors (Microsoft, Cisco, Mitel, snom, Pingtel, Siemens, and many others).SER's configuration ability meets needs of a whole range of scenarios including small-office use, enterprise PBX replacements and carrier services.

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