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Kamailio vs Routr: catalog facts
Kamailio	Routr
Free Free and open source under the GPLv2 or later.	Free Free and open source under the MIT licence.
Linux, Self-hosted	Self-hosted, Command line
Handles thousands of call setups per second WebSocket support for WebRTC plus TLS for secure signalling	Ready for Docker and Kubernetes deployments Managed via CLI, REST API or web interface
Infrastructure for engineers, not an end-user calling app Configuration requires solid SIP and VoIP knowledge	Aimed at carriers and integrators rather than home users Requires SIP knowledge to configure
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0-or-later	License: MIT
No account needed	Not stated if an account is 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 October 2, 2026

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