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.
Sofia-SIP is written in ANSI-C, and utilizes the POSIX base platform. The library supports a wide range of features related to SIP and SIMPLE technologies.
Sofia-SIP has been used as a platform for SIP related research in our group at NRC for many years, and we have now decided to open the platform for external developers as well.
Code is available at the OpenSource.nokia.com site.
