Linphone

2.2.1.1 (Android) November 14, 2013

2.1.2 (iOS ) November 22, 2013

1.0.1 (BlackBerry) January 11, 2011

1.0.2 ( Windows Phone ) November 25, 2013

Linphone is a free software for IP telephony ( VoIP), which is available under GNU GPLv2. It is a simple and reliable VoIP program with video transmission. Because of the fairly good video quality, it is suitable also for example conversations in sign language.

The program is available in a Linux, Windows and Mac OS X version for unix like operating systems, the freely available source code can be used. In addition, clients for Android, iOS, BlackBerry and Windows Phone exist. In addition to the GTK - based graphical interface, two console programs exist.

The program has the following features:

  • Internet telephony - based on the SIP standard
  • Video telephony or video conferencing
  • Presence (you can tell if a caller is currently reachable )
  • Encryption of audio and video transmission

For voice transmission, the following codecs are available:

  • G.711a or G.711u
  • GSM
  • Speex
  • LPC10 -15
  • G.722
  • Opus

Video transmissions can be performed with the following codecs:

  • H.263 or H.263
  • MPEG4 Part 2
  • Theora
  • H.264 ( with plug- in based on x264 )

Encryption may be performed with the following protocols:

For the operation behind a NAT router is the STUN protocol.

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