Linphone is free and open-source application that provides an internet phone or Voice Over IP phone (VoIP).
More information about using Linphone can be found HERE.
Here are some key features of "Linphone":
· SIP user agent compliant with RFC3261
· Supports multiple calls simultaneously with call management features: hold on with music, resume, transfer...
· Audio with the following codecs: speex (narrow band and wideband), G711 (ulaw,alaw), GSM, G722. Through additionals plugins, it also supports AMR-NB, SILK and iLBC.
· Video with codecs: VP8 (WebM), H263, H263-1998, MPEG4, theora and H264 (thanks to a plugin based on x264), with resolutions from QCIF(176x144) to SVGA(800x600) provided that network bandwidth and cpu power are sufficient.
· Supports IPv6
· Supports SIP/TLS
· Support SRTP
· Supports any webcam with a V4L or V4L2 driver under linux and Directshow driver on windows
· Text instant messaging and presence (using the SIMPLE standard)
· Addressbook
· DTMF (telephone tones) support using SIP INFO or RFC2833
· Understands SIP ENUMS (sip phone numbers using the naptr DNS service, without proxy)
· Acoustic echo cancelation using the great echo canceller available in libspeexdsp (works not only with speex codec of course)
· Multiple SIP proxy support: registrar, proxies, outbound proxies
· Digest authentication
· Nat friendly: guesses NAT address for SIP messages, uses STUN for RTP streams
Sound backends:
· Linux: ALSA, OSS, PulseAudio
· Windows: waveapi
· MacOSX: HAL Audio Unit
· iPhone: VoiceProcessing AudioUnit with built-in echo cancellation
· Android sound system
· JSR135 on BlackBerry
· Efficient bandwidth management: the bandwidth limitations are signaled using SDP (b=AS...), resulting in audio and video session established with bitrates that fits the user's network capabilities.
· Can use plugins: to add new codecs, or new core functionalities, such as remote directory search of sip addresses for example.
· Compliant with open standarts: see the full list there.
What's New in This Release: [ read full changelog ]
· This version brings audio conferencing, SRTP media encryption, SIP/TCP and SIP/TLS network protocols, G722 audio codec and VP8 video codec.
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