Flexisip by BelledonneCommunications
Linphone.org mirror for flexisip (git://git.linphone.org/flexisip.git)
About Flexisip
From the project's README at github.com/BelledonneCommunications/flexisip. Lightly cleaned for readability; for the full source see the upstream repo.
Flexisip is a comprehensive, modular and scalable SIP server suite written in C++17. It offers a wide range of functionalities, including:
Proxy Server: acts as a central hub for routing SIP messages. Push Notification Service: delivers SIP notifications (in-calls, messages) to mobile devices even when the app is not actively running. Presence Server: enables users to see the online status of others and their availability for calls. Conference Server: enables group voice and video calls. Back-to-Back User Agent (B2BUA) Server: enables caller identity translation, media-level transcoding and SIP trunking. RegEvent Server: notify tier domains of user registration. Deployment and Applications:
Server-based VoIP Service: Flexisip can be deployed on server machines to run a full-fledged SIP VoIP service. This is exemplified by the free linphone.org service, which has been powered by Flexisip since 2011. Users can create SIP accounts on this service to connect with each other. Embedded Solutions: Flexisip can also be embedded and run seamlessly on smaller hardware systems, making it suitable for various embedded applications. License
Flexisip is dual licensed, and can be licensed and distributed: under a GNU Affero GPLv3 license for free (see COPYING file for details) under a proprietary license, for closed source projects. Contact Belledonne Communica
Health score breakdown
6-dimension composite. See methodology for formula and weights.
Adoption signals
Real-world usage data, pulled from each registry. The bigger the numbers, the more battle-tested the project.
| Signal | Value | Source |
|---|---|---|
| GitHub stars | 181 | github.com/BelledonneCommunications/flexisip |
| GitHub forks | 80 | github.com/BelledonneCommunications/flexisip |
Release & maintenance
Is this project actively maintained, or about to die? Check the recency of last commit and last release.
| Project age | 11.0 years | since May 2015 |
| Last commit | 3 days ago | May 4, 2026 |
Self-hosting cost across providers
Detected requirements: 4GB RAM, 40GB disk minimum. Cheapest plan per provider that meets the requirement.
| Provider | Plan | Specs | Monthly | |
|---|---|---|---|---|
| hetzner | CAX11 | 2c · 4GB · 40GB | $4.13 USD | Deploy → |
| vultr | VC2 | 1c · 1GB · 25GB | $5 USD | Deploy → |
| linode | Nanode 1GB | 1c · 1GB · 25GB | $5.12 USD | Deploy → |
| digitalocean | Basic Regular 1GB | 1c · 1GB · 25GB | $6 USD | Deploy → |
What people say on Hacker News
- Ask HN:How's you experience building an app on Cloudflare? (Workers, D1,R2 etc.)
- Show HN: MAItion – Open-source RAG with pluggable connectors and chat UI
- Show HN: Harness – Manage parallel Claude Code agents across Git worktrees
- GPU at $2.25/HR or $12.29/HR: The Infrastructure Layer That Determines Price
- Show HN: Vaava – a baby routine tracker / logging app
Ready to self-host Flexisip?
Spin up a hetzner CAX11 (4GB RAM, 40GB disk) for $4.13/mo and follow the project's official install docs.
Data last refreshed May 7, 2026.
Similar open-source projects
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