Compare software

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