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OpenSIPS vs ejabberd: catalog facts
OpenSIPS	ejabberd
Free Free and open source; paid training courses are offered separately.	Free Free and open source.
Linux, Self-hosted	Linux, Self-hosted
Handles high SIP traffic volumes Covers many roles from PBX to load balancer	XMPP, MQTT and SIP in one server Over 400 XMPP extensions supported
Steep learning curve, aimed at telecom engineers Signaling server only, not an end-user calling app	More complex than servers built for small groups Erlang-based stack can be unfamiliar to admins
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: GPL-2.0	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 23, 2026

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