Compare software

Asterisk vs OpenSIPS: catalog facts
Asterisk	OpenSIPS
Free Free and open source.	Free Free and open source; paid training courses are offered separately.
Linux, Self-hosted	Linux, Self-hosted
Run your own PBX and VoIP system Flexible enough to build custom telephony setups	Handles high SIP traffic volumes Covers many roles from PBX to load balancer
Configuration requires telephony knowledge A framework to build on rather than a ready-to-use phone system	Steep learning curve, aimed at telecom engineers Signaling server only, not an end-user calling app
Downloadable app, Self-hosted	Downloadable app, Self-hosted
Open source	Open source
License not stated	License: GPL-2.0
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.