OpenSIPS Project it was formerly known as OpenSER Project.
OpenSIPS can be used as :
SIP registrar server
SIP router / proxy (lcr, dynamic routing, dialplan features)
SIP redirect server
SIP presence agent
SIP IM server (chat and end-2-end IM)
SIP to SMS gateway (bidirectional)
SIP to XMPP gateway for presence and IM (bidirectional)
SIP load-balancer or dispatcher
SIP front end for gateways/asterisk
SIP NAT traversal unit
SIP application server
What's New in This Release: [ read full changelog ]
· This version adds several major improvements (scripting, dialog support, TCP, Web Sockets, timers), but also new functionalities like CacheDB Interface-CouchBase, MongoDB, Cache2SQL, and a nice provisioning tool, the PI_HTTP module, or a great helper on integration, the Event_Route module (combined with a rich set of new events from core and modules).
· The important goals of this release were scalability (geo and load), integration capabilities, and controllability (debugging, tracing, monitoring).