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is an open source instant messaging and voice/video over IP (VoIP) phone that makes it possible to communicate freely with people over the internet via voice, video and text messaging.
Since it follows open standards from the telecommunications industry (SIP, RTP), Linphone is interoperable with most PBXs and SIP servers, including our own Flexisip server, and can be used with any SIP VoIP operator.
Discover complementary products in our complete solution for instant messaging and IP-to-IP calls, such as Linphone applications, Liblinphone cross-platform VoIP SDK and Flexisip server.
Many new features are still under development on a medium- or long-term basis. Please feel free to contact us if you want to know more about our development roadmap, or if you are interested in financing the development of a particular feature.
Linphone is one of the most famous open source softphones in the world. It is fully SIP-based, for all calling, presence and IM features.
Use Linphone for free, and enjoy its intuitive interface and advanced features with our free SIP service or with an existing SIP account.
Android
iOS
Linphone Desktop 4, the brand new version of Linphone for desktop platforms, is perfectly suited for both standard users with no specific knowledge of VoIP/SIP and for advanced audio/video calling use cases in a professional environment.
It is fully SIP-based, for all calling, presence and IM features.
Use Linphone Desktop for free, and enjoy its modern look and feel and its many advanced features with our free SIP service or with an existing SIP account.
GNU / Linux
macOS
Windows Desktop
Linphone Desktop is now able to interact with web browsers and can be integrated with your Web Services.
Since we are experiencing increasing demand for advanced solutions for professionals, we have made the latest version of Linphone for Desktop (4.2) capable of receiving information from a web browser to start a call, open the app, invite participants to a conference call etc.
Chrome
Edge
Firefox
Safari
Liblinphone is a high-level open source library that integrates all the SIP voice/video and instant messaging features into a single easy-to-use API.
This is the VoIP SDK engine on which Linphone applications are based!
Liblinphone combines our media processing and streaming toolkit (Mediastreamer2) with our user-agent library for SIP signaling (belle-sip).
Consult our technical corner to see all supported standards and RFCs.
Flexisip is a complete, modular and scalable SIP server suite that includes proxy, presence, and group chat functions.
Flexisip offers an easy-to-install SIP server solution, offering all the features required to deploy your own SIP service tuned for mobile or desktop applications, « out of the box ».
The free sip.linphone.org SIP service has run on Flexisip since 2011, and enables Linphone users to create their own SIP addresses to connect with each other.
Flexisip manages SIP SUBSCRIBE and PUBLISH from client applications, in order to :
Flexisip can be integrated into your SIP infrastructure for various purposes, for example IN THE CLOUD in order to run your own VoIP service, EMBEDDED in small hardware systems or in its PUSH GATEWAY mode of operation.
Our tunnelling solution has been developed for VoIP operators who wish to bypass VoIP blocking in some countries or illegitimate firewall restrictions on 3G networks.
All SIP and RTP traffic is tunnelled through a single secure https connection to a detunneliser server.
Linphone Instant Messaging Encryption library (LIME) provides end-to-end encryption for instant messaging, allowing users to exchange messages privately and asynchronously. It supports multiple devices per user and multiple users per device.
LIME offers two major security benefits to Instant Messaging users:
Mediastreamer2 is a powerful lightweight streaming engine for voice/video telephony applications.
This open source library is responsible for receiving and sending all multimedia streams in Linphone, including voice/video capture, encoding and decoding, and rendering.
Bcg729 is an open source implementation of both encoder and decoder of the ITU G729 Annex A/B speech codec.
The library is fully portable and can be executed on many platforms including both ARM and x86 processors. libbcg729 supports concurrent channels encoding/decoding for multi call application such as conferencing.
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