Baresip is a portable and modular SIP User-Agent with audio and
video support.

Features

* Audio codecs: AMR, BV32, Celt, G.711, G.722, G.722.1, G.726, GSM,
  iLBC, iSAC, L16, OPUS, Silk, Speex
* Video codecs: H.263, H.264, MPEG4, VP8
* Audio drivers: Alsa, Coreaudio, Gstreamer, Symbian MDA, OpenSLES,
  OSS, Portaudio, Windows wave
* Video sources: FFmpeg avformat, MacOSX qtcapture, MacOSX quicktime,
  Video4Linux and Video4Linux2, X11 Grabber
* Video output modules: OpenGL, SDL/SDL2, X11, DirectFB
* NAT Traversal modules: STUN, TURN, ICE, NAT-PMP
* Media encryption modules: SRTP, DTLS-SRTP, ZRTP