OpenSIPS is a very fast and flexible SIP (RFC3261) server. Written entirely in C, OpenSIPS can handle thousands calls per second even on low-budget hardware.

C Shell-like scripting language provides full control over the server's behaviour. Its modular architecture allows only required functionality to be loaded.

Among others, the following modules are available: Digest Authentication, CPL scripts, Instant Messaging, MySQL support, Presence Agent, Radius Authentication, Record Routing, SMS Gateway, Jabber/XMPP Gateway, Transaction Module, Registrar and User Location, Load Balaning/Dispatching/LCR, XMLRPC Interface.

This package contains the main OpenSIPS binary along with the principal modules and support binaries including opensipsmc configuration tool.