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

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

Discover our VoIP
and Instant Messaging
solutions in 3 minutes!

Solutions, resources and commercial offers

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Products

What is behind Linphone, and what software do you actually need? Discover the whole software family that we develop and distribute.

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Solutions

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.

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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.

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Company

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.

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Developer wiki

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

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White papers

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

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Technical corner

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

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Features

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.

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FAQ

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.

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Free SIP service

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

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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
Multi-language

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.
Easy-to-use

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

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

Latest news

Press release following the massive ransomware attack targeting VMware ESXI servers

February

2023

We share with you our state of play following the massive ransomware attack targeting VMware ESXI servers, one of our machine was infected on Friday 3rd of Februray 2023.

We will be at FOSDEM!

January

2023

February 4-5, let's meet up!

Secure voice/video over IP communications today and tomorrow thanks to post-quantum encryption!

January

2023

The Linphone softphone includes CRYSTALS-Kyber, the NIST finalist algorithm in the encryption key category

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