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OpenSIPS vs FreeSWITCH: catalog facts
OpenSIPS	FreeSWITCH
Free Free and open source; paid training courses are offered separately.	Free Free source code; commercially supported builds and professional services are available.
Linux, Self-hosted	Windows, macOS, Linux, Self-hosted
Handles high SIP traffic volumes Covers many roles from PBX to load balancer	Runs on hardware from a Raspberry Pi to multi-core servers Handles voice, video and chat
Steep learning curve, aimed at telecom engineers Signaling server only, not an end-user calling app	Distributed mainly as source code to build Requires telephony and server administration knowledge
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 24, 2026

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