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OpenSIPS vs Asterisk: catalog facts
OpenSIPS	Asterisk
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	Run your own PBX and VoIP system Flexible enough to build custom telephony setups
Steep learning curve, aimed at telecom engineers Signaling server only, not an end-user calling app	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	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.