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The SER SIP Express Router Softswitch

The SIP Express Router (SER) is an open source softswitch which is licensed under the GPL. SIP Express Router is a high-performance, configurable, free SIP (RFC3261) server . The SER Softswitch can act as registrar, proxy or redirect server. SER Softswitch features an application-server interface, presence support, SMS gateway, SIMPLE2 Jabber gateway, RADIUS/syslog accounting and authorization, server status monitoring, FCP security, etc. The SER Softswitch performance allows it to deal with operational burdens, such as broken network components, attacks, power-up reboots and rapidly growing user population. SER's configuration ability meets needs of a whole range of scenarios including small-office use, enterprise PBX replacements and carrier services. For more information visit

Interoperability Status: Extensive Successful Carrier Deployments

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