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Asterisk vs Kamailio: catalog facts
Asterisk	Kamailio
Free Free and open source.	Free Free and open source under the GPLv2 or later.
Linux, Self-hosted	Linux, Self-hosted
Run your own PBX and VoIP system Flexible enough to build custom telephony setups	Handles thousands of call setups per second WebSocket support for WebRTC plus TLS for secure signalling
Configuration requires telephony knowledge A framework to build on rather than a ready-to-use phone system	Infrastructure for engineers, not an end-user calling app Configuration requires solid SIP and VoIP knowledge
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	License: GPL-2.0-or-later
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 September 24, 2026	Official website Full listing and sources Checked October 2, 2026

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