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Sunday, August 22, 2010

Linphone features | Linphone, an open-source video sip phone

Linphone features

Core features

  • SIP user agent compliant with RFC3261
  • Decoupling between liblinphone engine and graphical UI: allows to integrate linphone functionnalities in any graphical application.
  • Audio with the following codecs: speex (narrow band and wideband), G711 (ulaw,alaw), GSM. Through additionals plugins, it also supports AMR and iLBC.
  • Video with codecs: 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 any webcam with a V4L or V4L2 driver under linux and Directshow driver on windows
  • Text instant messaging and presence (using the SIMPLE standart)
  • Addressbook
  • DTMF (telephone tones) support using SIP INFO or RFC2833
  • Understands SIP ENUMS (sip phone numbers using the naptr DNS service, without proxy)
  • Echo cancelation using the great speex echo canceler
  • 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: audio queues
    • iPhone: AudioUnit
    • Android sound system
  • 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.

User interfaces

Gtk2 graphical interface

It is running for Linux, Windows and MacOSX

Console tools

  • Linphonec is a command line interface that can use readline on linux to get completion, history, such as bash.
  • Linphonecsh is another command line tool to remotely control a linphonec daemon. Unlike linphonec, linphonecsh immediately exits once the command is executed.

Mobile phones interfaces

  • Android application (no video support yet)
  • iPhone application (no video support yet)


  • Linux/x86 and Linux/x86-64
  • Windows XP and Vista
  • Linux/ARM: without graphical interface. Linphonec or liblinphone are good candidates to provide the software stack of an hardware phone or hardware communication system.
  • Linux/Blackfin: The project maintains a port of linphone for blackfin processors, without gui. Performance are impressive. See here for details.
  • MacOS X x86 : audio only version for now. Linphone is integrated in macports.
  • Google Android: audio only version, download with the Android Market from your phone.
  • Iphone OS: audio only version, download from the AppStore on your iphone or ipod touch.
  • May work also on FreeBSD and OpenBSD with minor modifications to the build system.

Go there...

Internet Phone Apps
GNU SIP Witch - GNU Project - Free Software Foundation (FSF)
Linphone features | Linphone, an open-source video sip phone
AsteriskNOW | Asterisk


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