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Kamailio vs FreeSWITCH: catalog facts
Kamailio	FreeSWITCH
Free Free and open source under the GPLv2 or later.	Free Free source code; commercially supported builds and professional services are available.
Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Handles thousands of call setups per second WebSocket support for WebRTC plus TLS for secure signalling	Runs on hardware from a Raspberry Pi to multi-core servers Handles voice, video and chat
Infrastructure for engineers, not an end-user calling app Configuration requires solid SIP and VoIP knowledge	Distributed mainly as source code to build Requires telephony and server administration knowledge
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later	License not stated
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.