# flexisip

> Flexisip is a self-hosted, open-source SIP server suite in C++20 providing proxy, presence, conference, B2BUA, and push notifications for real-time communications.

- **Category:** VoIP
- **Licence:** AGPL-3.0
- **Latest version:** 2.6.2
- **Open source:** open_core
- **Languages:** C, C++
- **Platforms:** Docker, Linux, Debian, Nix, Build from Source
- **Tags:** Proxy, Push Notifications, High Availability, Voip, Cpp, Sip, Sip Proxy, Stun, Cluster, Server, Agpl, Conference, Presence, Sip trunking, Linphone, Flexisip, Sip Bridge, Media Relay, B2bua, Asterisk Alternative, Freeswitch Alternative, Pstn Gateway, Ice

## Description

Flexisip is a modular SIP server suite from Belledonne Communications written in C++20. It provides a SIP proxy for routing calls and messages, a presence server for user availability, a conference server for group communications, a B2BUA for PSTN gateway integration with media transcoding, a RegEvent server, and a push notification gateway for mobile devices. The software uses a dual license model (AGPL-3.0 and proprietary). Deployment options include Docker, system packages for Debian/Ubuntu/RockyLinux, and source builds. Flexisip has powered the free linphone.org SIP service since 2011 and serves organizations needing VoIP services, embedded systems, or push notification support for existing SIP infrastructure.

## Links

- [Homepage](https://github.com/BelledonneCommunications/flexisip)
- [Website](https://www.linphone.org/en/flexisip-sip-server/)
- [Documentation Wiki](https://wiki.linphone.org/xwiki/wiki/public/view/Flexisip/)
- [GitLab Source Code](https://gitlab.linphone.org/BC/public/flexisip)
- [Installation Guide](https://wiki.linphone.org/xwiki/wiki/public/view/Flexisip/1.%20Installation/)
- [Configuration Guide](https://wiki.linphone.org/xwiki/wiki/public/view/Flexisip/Configuration/)
- [Supported Features & Standards](https://wiki.linphone.org/xwiki/wiki/public/view/Flexisip/C.%20Features/Supported%20features%20and%20standards/)
- [Linphone Website](https://www.linphone.org/en/voip-unified-communications-software/)

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Source: https://selfhost.directory/project/flexisip