Our products and services focus: voice and video over IP applications and communication systems.

LINPHONE, SIP phone for voice/video calls and instant messaging

Linphone is an open source SIP Phone for voice/video calls and instant messaging, available on mobile and desktop environments (iOS, Android, GNU/Linux, MAC OSX, Windows Desktop, Windows 10 UWP).

Linphone has inside a separation between the user interfaces and the core engine, allowing to create various kind of user interface on top of the same functionalities.

- The user interface frontends:

  • Qt/QML interface for Windows, Mac and GNU/Linux
  • The console interface (linphone-daemon)
  • The iPhone application built in objective C
  • The Android application running in java
  • The Windows 10 application (UWP : mobile and desktop) written in C#

- Liblinphone, the core engine: this is the library that implements all the functionalities of Linphone.

Liblinphone is a powerful SIP VoIP video SDK that anyone can use to add audio and video calls or instant messaging capabilities to an application. It provides a high level api to initiate, receive, terminate audio & video calls.

Liblinphone relies on the following software components:

  • Mediastreamer2, a powerful multimedia SDK to make audio/video streaming and processing
  • oRTP, a simple RTP library
  • belle-sip, the SIP library

and all its dependencies are written in C++ and C.


Linphone is dual licensed. It can be licensed and distributed:

  • under GNU GPLv2 license - for free (open source)
  • under proprietary and commercial license to be used in closed source applications.

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