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