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.
• Modular design: proxy, presence and conference functions
• Integrated with push notifications systems
• High availability and cluster mode
• NAT-aware, built-in media relay, STUN server
• Easy to install, configure and maintain
• Your own SIP service “out of the box”
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.
Licensing and services
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.
Free SIP service
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
Welcome to Linphone
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