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Linphone
38100 Grenoble, France
What it is
Linphone is a free, open-source application for VoIP voice and video calls, instant messaging, and videoconferencing. It uses SIP and SIP SIMPLE to interoperate with IP-PBXs, proxies, SBCs, and other SIP systems. Calling features include HD audio and video, forwarding, concurrent call management, recording, DTMF, and Bluetooth headset support. Its Flexisip or SaaS conferencing option supports video meetings with up to 50 participants and screen sharing. Messaging capabilities depend on the setup: Flexisip supports group chats, file sharing, read receipts, reactions, voice messages, and ephemeral messages, while SIP SIMPLE supports basic one-to-one messaging with third-party accounts. Security features include encrypted signaling and media, end-to-end encryption for exchanged media, and post-quantum encryption using CRYSTALS-Kyber. Flexisip can be hosted on premises and connected to an existing SIP server for group messaging and videoconferencing. Linphone is available on Android, iOS, Linux, macOS, web, and Windows, with API and self-hosted options. Its free SIP service is reserved for individuals and has no guaranteed support; paid support and maintenance are available by contacting the company.
For and against
For
- Open-source and available for free.
- Works with SIP and SIP SIMPLE systems.
- Supports HD calling, recording, and call forwarding.
- Conferencing supports up to 50 participants and screen sharing.
- Flexisip supports group messaging and file sharing.
Against
- Free SIP service is reserved for individuals.
- Free SIP service has no guaranteed support.
- Closed-source modifications require proprietary licensing.
The verdict
Linphone offers a broad set of calling and messaging functions, with capabilities that vary by SIP SIMPLE or Flexisip setup. Its free individual SIP service has no guaranteed support, while paid support and maintenance require contacting the company.
Who it suits
Linphone may suit individuals or organizations using SIP systems for calling and messaging. Its open-source and self-hosting options may appeal to teams integrating communications into their own projects.
Plans and prices
Linphone softphone
Free app and individual SIP service; no guaranteed support for free SIP service
Read 29 Sep 2026 · linphone.org
On the record
- Business model
- Linphone offers white-label branding, support contracts, development assistance, and custom feature development, with pricing available by contacting the company.linphone.org · read 29 Sep 2026
- Calling
- Features include HD audio and video calling, call forwarding, concurrent call management, recording, DTMF, and Bluetooth headset support.linphone.org · read 29 Sep 2026
- Group meetings
- Its Flexisip or SaaS conferencing option supports video conferences with up to 50 participants and screen sharing.linphone.org · read 29 Sep 2026
- Integrations
- Linphone supports LDAP and CardDAV contact synchronization, OpenID Connect and OAuth 2.0 authentication, and Apple APNs and Google Firebase push notifications.linphone.org · read 29 Sep 2026
- Maker
- Belledonne Communications is a French company founded in 2010 and based at 3 Avenue Marie Reynoard, 38100 Grenoble, France.linphone.org · read 29 Sep 2026
- Messaging
- Flexisip enables one-to-one and group chats, file sharing, read receipts, reactions, voice messages, and ephemeral messages; SIP SIMPLE supports basic one-to-one messaging with third-party accounts.linphone.org · read 29 Sep 2026
- Open source
- Linphone is open source and can be integrated into projects under the GNU GPLv3 license; proprietary licensing is available for closed-source modifications.linphone.org · read 29 Sep 2026
- Purpose
- Linphone combines VoIP voice and video calling, instant messaging, and videoconferencing in one application.linphone.org · read 29 Sep 2026
- Security
- Security features include SIP/TLS, SRTP, SRTP-DTLS, ZRTP, end-to-end encryption for exchanged media, and post-quantum encryption using CRYSTALS-Kyber.linphone.org · read 29 Sep 2026
- Self-hosting
- Flexisip can be deployed on premises and connected to an existing SIP server for group messaging and videoconferencing.linphone.org · read 29 Sep 2026
- SIP interoperability
- It uses SIP and SIP SIMPLE and is designed to interoperate with IP-PBXs, proxies, SBCs, and other SIP systems.linphone.org · read 29 Sep 2026
- Support
- The free SIP service is reserved for individual users and comes with no guarantee of support; paid support and maintenance services are available by contacting the company.linphone.org · read 29 Sep 2026
