PJMEDIA is an Open Source media stack written in C and is optimized for multimedia over IP communications.

Among the features:

• it is optimized for small footprint,
• very very portable (Win32, Windows Mobile, Linux, *nix, MacOS X, Symbian, etc.),
• it works with any clock rate (8KHz and above),
• filter like (media ports) framework,
• supports codecs like Speex, iLBC, GSM, G.711, etc.
• conference bridge, VAD, PLC, AEC, adaptive jitter buffer, etc.

Links

• PJMEDIA features
• PJSUA - Portable SIP user agent featuring PJMEDIA