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FreeSWITCH vs Flexisip: catalog facts
FreeSWITCH	Flexisip
Free Free source code; commercially supported builds and professional services are available.	Free Free under the AGPL 3.0, with a paid proprietary licence for closed-source use.
Windows, macOS, Linux, Self-hosted	Self-hosted
Runs on hardware from a Raspberry Pi to multi-core servers Handles voice, video and chat	Push gateway delivers calls and messages to mobile apps in the background Proxy, presence and B2BUA in one suite
Distributed mainly as source code to build Requires telephony and server administration knowledge	Requires SIP and VoIP knowledge to deploy Conference server is now a separate package
Self-hosted	Self-hosted
Open source	Open source
License not stated	License: AGPL-3.0
No account needed	Not stated if an account is 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.