Sofia-SIP : A SIP user agent library, compliant with the IETF RFC3261 specification

Sofia-SIP is a 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 is GNU/Linux. Sofia-SIP is based on a SIP stack developed at the Nokia Research Center.

[License] OSI Approved :: GNU Lesser General Public License (LGPL)
[Operating System] POSIX
[Programming Language] C
[Topic] Communications :: Chat, Communications :: Conferencing, Communications :: Internet Phone, Communications :: Telephony, Internet