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• HD audio and video calls
• Audio conferences and advanced calling features
• Instant messaging (IM) and group chat
• Picture and file sharing
• Secure calls
• End-to-end encryption for messaging
• Fully SIP-based, for all calling, presence and IM features
• Intuitive and modern UI
• Audio conference calls and advanced calling features
• HD video calls in full screen mode
• Instant Messaging (IM) and File sharing
• Secure communications
• Presence status
• Fully SIP-based, for all calling, presence and IM features
• Multi-participant groups
• End-to-end encryption for messaging
• Multi-device support
• Intuitive message delivery status
• Easy management of participants and admins
• Based on SIP, evolving towards RCS specifications
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.
Access detailed technical information about our software applications, including our software architecture, supported RFCs, API documentation, how to get the source code and more.
Learn how to use Linphone and Flexisip to build your intercom system, your secure VoIP solution or your social networking app.
Much more technical information is available, and most of the developer guidelines are held in Linphone’s technical public wiki.
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.
Build your secure communications app with Linphone
Secure user authentication
and call setup, with SHA-256 digest authentication or TLS client certificates.
Secure voice & video calls
based on ZRTP or SRTP-DTLS end-to-end encryption protocols, using AES 128-bit or 256-bit key length and safe Elliptic Curves Diffie-Hellman (ECDH) X25519 and X448.
Secure im and group chat (mobile only)
with Linphone Instant Messaging Encryption (LIME), using modern ciphering curve X448 and double ratchet algorithm for perfect forward secrecy.
December
2019
Starting from Linphone 4.2 and linphone-sdk 4.3 versions, all of our client open source projects will now be distributed under the GNU/GPLv3 public license.
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December
2019
The Flexisip server suite has been extended with a new component, Flexisip Account Manager, which can be used to bring account creation and user authentication features to Linphone-based and Liblinphone-based applications.
Read more
December
2019
This new release of Linphone brings great improvements in the source code of both the cross-platform Liblinphone library and of the iOS/Android Linphone applications.
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