Top pick · highest health
Routr
Lightweight SIP proxy, location server, and registrar for a reliable and scalable SIP infrastructure.
★ 1.7k 375 commits / 90d ⟳ today MIT Docker
Category
Open source communication - sip
SIP/IPBX telephony software. This page ranks 13 open-source SIP projects by a health score recomputed every night from repository data; nothing else affects the order. Routr leads at 93/100 with 375 commits in the last 90 days and 1.7k stars, followed by SIPCAPTURE Homer (93) and FreeSWITCH (85). 7 of the 13 score 70 or above, 3 publish a Docker image, and the median health is 77. GPL-2.0 is the most common licence, carried by 5 of them. Between them they stand in for Twilio, Dialpad and Google Voice. The score weighs commits in the last 90 days, release recency, stars, archive status and Docker support; a low number means low measurable activity, not low quality, so a finished, stable tool can legitimately sit lower down.
updated Oct 2026 13 tools ★ 19k stars 3 with Docker median 77
Best for…
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Most starred
5,267 stars on GitHub, the largest community in the category.
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Most active
642 commits in the last 90 days, the fastest-moving codebase here.
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Most permissive
MIT licence with health 93/100: the strongest option if you need to embed or fork commercially.
Ranked by health
Table view
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SIPCAPTURE Homer
Troubleshooting and monitoring VoIP calls.
★ 2k 330 commits / 90d ⟳ 3 days ago AGPL-3.0 Docker
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FreeSWITCH
Scalable open source cross-platform telephony platform.
★ 5.3k 78 commits / 90d ⟳ 2 days ago MPL-2.0
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Asterisk
Easy to use but advanced IP PBX system, VoIP gateway and conference server.
★ 3.7k 86 commits / 90d ⟳ yesterday GPL-2.0
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Kamailio
Modular SIP server (registrar/proxy/router/etc).
★ 3k 642 commits / 90d ⟳ yesterday GPL-2.0
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FusionPBX
Web interface for multi-platform voice switch called FreeSWITCH.
★ 1.1k 312 commits / 90d ⟳ yesterday MPL-1.1
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Yeti-Switch
Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.
★ 68 111 commits / 90d ⟳ 9 days ago GPL-2.0
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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.
★ 193 61 commits / 90d ⟳ today AGPL-3.0 Docker
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openSIPS
SIP proxy/server for voice, video, IM, presence and any other SIP extensions.
★ 1.5k 401 commits / 90d ⟳ yesterday GPL-2.0
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3CX
Full-featured PABX system, with call queues, built-in web conferencing, live chat and social media messaging all on one system.
★ 0 0 commits / 90d ⟳ unknown ⊘ Proprietary
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Freepbx
Web-based open source GUI that controls and manages Asterisk.
★ 0 0 commits / 90d ⟳ unknown GPL-2.0
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Wazo
Full-featured IPBX solution built atop Asterisk with integrated Web administration interface and REST-ful API.
★ 0 0 commits / 90d ⟳ unknown GPL-3.0
| # | ||||||
|---|---|---|---|---|---|---|
| 1 | Routr Docker | 1.7k | 375 | MIT | today | |
| 2 | SIPCAPTURE Homer Docker | 2k | 330 | AGPL-3.0 | 3 days ago | |
| 3 | FreeSWITCH | 5.3k | 78 | MPL-2.0 | 2 days ago | |
| 4 | Asterisk | 3.7k | 86 | GPL-2.0 | yesterday | |
| 5 | Kamailio | 3k | 642 | GPL-2.0 | yesterday | |
| 6 | FusionPBX | 1.1k | 312 | MPL-1.1 | yesterday | |
| 7 | Yeti-Switch | 68 | 111 | GPL-2.0 | 9 days ago | |
| 8 | Flexisip Docker | 193 | 61 | AGPL-3.0 | today | |
| 9 | openSIPS | 1.5k | 401 | GPL-2.0 | yesterday | |
| 10 | SIP3 | 78 | 9 | Apache-2.0 | 4 days ago | |
| 11 | 3CX | 0 | 0 | ⊘ Proprietary | unknown | |
| 12 | Freepbx | 0 | 0 | GPL-2.0 | unknown | |
| 13 | Wazo | 0 | 0 | GPL-3.0 | unknown |
How the SIP tools compare
Routr and SIPCAPTURE Homer tie at 93/100. FreeSWITCH has the largest following at 5.3k stars, yet ranks #3 of 13, held back mostly by Docker support (no Docker image).
The most recent release is Routr v2.31.6, published today. Flexisip, openSIPS and SIP3 publish no tagged releases, which costs up to 25 of the 100 points. SIP3 scores under 40, so check recent activity before adopting it. By stack, C (5), PHP (2) and C++ (1) are the most common. Routr, FreeSWITCH, FusionPBX and 1 more are permissively licensed; SIPCAPTURE Homer, Asterisk, Kamailio and 5 more are copyleft. 3CX is source-available rather than open source, which limits commercial reuse. 3CX, Freepbx and Wazo are not hosted on a forge Repoly can read, so they have no measured score yet.
Communication - SIP: common questions
What is the best open source SIP tool?
By Repoly's GitHub health score, Routr at 93/100 (375 commits in 90 days, v2.31.6 from today). SIPCAPTURE Homer is next at 93. The score measures maintenance, not features, so shortlist the top few and try them.
Which SIP tools are the most actively developed?
Kamailio (642 commits in 90 days), openSIPS (401 commits in 90 days) and Routr (375 commits in 90 days). Commit activity is 35 of the 100 health points, the largest single term.
Which SIP tools can I run in Docker?
3 of 13 publish a Docker image or Compose file, led by Routr, SIPCAPTURE Homer and Flexisip.
Which SIP tools have a permissive licence?
4 of 13: Routr (MIT), FreeSWITCH (MPL-2.0), FusionPBX (MPL-1.1), SIP3 (Apache-2.0). 8 are copyleft.
Which paid products can open source SIP tools replace?
Twilio (Routr ranks highest here), Dialpad (Asterisk ranks highest here) and Google Voice (FreeSWITCH ranks highest here).
