A Linphone extension providing Post Quantum Cryptography (using the Crystals-KYBER algorithm)
A powerful voice/video streaming engine for telephony apps & a C library implementing RTT Protocol
A VoIP anti-blocking solution to overcome VoIP blocking and firewall restrictions
A fully portable C99 implementation of both an encoder and decoder for the G
729 A/B codec
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for smartphones, tablets and desktop platforms

• HD audio and video calling
• Audio/video meetings and group calling
• Secure communications with post quantum end-to-end encryption
• Instant messaging (IM), group chat and file sharing
• Interconnection with Apple's and Google's push notification systems
• Account creation and remote configuration (via QR code or URL)
• Fully SIP-based, for all calling, presence and IM features

A complete, secure and interoperable SIP software solution for communication systems developers

Discover our VoIP
and Instant Messaging
solutions in 3 minutes!
What is behind Linphone, and what software do you actually need? Discover the whole software family that we develop and distribute

Wondering how you can use Linphone, Liblinphone SDK or Flexisip server in your own, specific VoIP project? Read common use cases and consult our white papers

Undecided between open source or proprietary licenses, or need help with your project? Learn about our licensing model and our available range of professional services

Who are we and what do we do? Learn the story of the company behind the Linphone project, see our team’s skills and read some of our references

Much more technical information is available, and most of the developer guidelines are held in Linphone’s technical public wiki

Learn how to use Linphone and Flexisip to build your intercom system, your secure VoIP solution or your social networking app

Access detailed technical information about our software applications, including our software architecture, supported RFCs, API documentation, how to get the source code and more

Linphone is an open source SIP phone that makes it possible to communicate freely with people over the internet
Find out what it can do

If you are in any doubt about how to start using Linphone and make the most of all the available features, you can look for answers in our Frequently Asked Questions

Create and manage your Linphone account (which means your own SIP address) to start using Linphone and connect with your friends

Choose Liblinphone, the easiest way to bring advanced VoIP & IM features to software applications or hardware products

• CROSS-PLATFORM
  A single SDK with abstraction of platform specificities, to develop your VoIP client for smartphones, tablets, desktop platforms and embedded systems
  A single SDK with abstraction of platform specificities, to develop your VoIP client for smartphones, tablets, desktop platforms and embedded systems

• MULTI-LANGUAGE
  Liblinphone offers APIs for various programming languages: C#, Java/Kotlin, Swift, C++ and C

• Liblinphone offers APIs for various programming languages: C#, Java/Kotlin, Swift, C++ and C

• EASY-TO-GET
  Seamless integration with mobile platform IDEs thanks to our Maven repository and Cocoapods

• SDK packages are available and source code is publicly shared

• Seamless integration with mobile platform IDEs thanks to our Maven repository and Cocoapods
  SDK packages are available and source code is publicly shared

• EASY-TO-USE
  Thanks to our tutorials, public Wiki, and development assistance service

• Thanks to our tutorials, public Wiki, and development assistance service

Build your secure communications app with Linphone