Flexisip

Complete, modular and scalable SIP server, includes a push gateway, to deliver SIP incoming calls or text messages on mobile device platforms where push notifications are required to receive information when the app is not active in the foreground.

Description from awesome-selfhosted (CC BY-SA 3.0)

Still maintained? Yes: 61 commits in the last 90 days.

Comparisons in Communication - SIP: Twilio alternatives, Dialpad alternatives, Google Voice alternatives.

Docker #8 of 13 in Communication - SIP

At a glance

Flexisip quick facts

Health score: 64/100 SLOWING
Stars: 193
Last commit: today (Oct 2026)
Latest release: No tagged release
Licence: AGPL-3.0

View BelledonneCommunications/flexisip on GitHub ↗ Website ↗

Top alternatives to Flexisip

In its own words

The project's README opens: "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. 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."

Why it ranks here

Health score explained

Flexisip scores 64/100, #8 of 13 in Communication - SIP: 61 commits in the last 90 days earn 35.0 of 35 points, the absence of a tagged release forfeits all 25 release points, 193 stars add 9.2 of 20, an active, unarchived repository keeps 10 and Docker support adds the final 10. That places it in the slowing band (40 to 69). The biggest shortfall is release recency, worth 25.0 more points.

Recomputed nightly from the GitHub API. How the score is calculated.

Commit activity 35.0 / 35

61 commits in 90 days (30+ scores full marks)
Release recency biggest shortfall 0.0 / 25

No tagged release found
Stars 9.2 / 20

193 stars on GitHub (logarithmic)
Not archived 10.0 / 10

Repository is active
Docker support 10.0 / 10

Docker image or Compose file available

Commit activity

61
Last 90 days: 273
Last 12 months: today
Last push

Ranked #8 of 13 tools in Communication - SIP by health , between Yeti-Switch (#7) and openSIPS (#9) .

Details

Licence	AGPL-3.0
Platforms	C, Docker
Latest release	No tagged release
Stars	193
Open issues	27
Docker	Yes
Repository	BelledonneCommunications/flexisip ↗

Visit website ↗ Source code ↗

Flexisip vs its top 5 alternatives

Active tools that share a category with Flexisip (Communication - SIP), scored on the same five terms.

Tool	Health	Stars	Licence	Last commit
Routr	93	1.7k	MIT	today
SIPCAPTURE Homer	93	2k	AGPL-3.0	3 days ago
FreeSWITCH	85	5.3k	MPL-2.0	2 days ago
Asterisk	84	3.7k	GPL-2.0	yesterday
Kamailio	84	3k	GPL-2.0	yesterday
Flexisip (this tool)	64	193	AGPL-3.0	today