Description:

Ser or SIP Express Router is a very fast and flexible SIP (RFC3621)
proxy server. Written entirely in C, ser can handle thousands calls
per second even on low-budget hardware. A C Shell like scripting language
provides full control over the server's behaviour. It's modular
architecture allows only required functionality to be loaded.
Currently the following modules are available: digest authentication,
CPL scripts, instant messaging, MySQL support, a presence agent, radius
authentication, record routing, an SMS gateway, a jabber gateway, a
transaction module, registrar and user location.