Sofia-Sip is an open-source Sip User-Agent library, compliant
with the IETF RFC3261 specification. It can be used as
a building block for Sip client software for uses such as VoIP,
IM, and many other real-time and person-to-person communication
services. The primary target platform for Sofia-Sip is
GNU/Linux. Sofia-Sip is based on a Sip stack developed at
the Nokia Research Center.
