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Flexisip vs FreeSWITCH: catalog facts
Flexisip	FreeSWITCH
Best for: Running your own SIP VoIP service, especially for Linphone mobile users	Best for: Administrators building a self-hosted PBX or VoIP system
Free Free under the AGPL 3.0, with a paid proprietary licence for closed-source use.	Free Free source code; commercially supported builds and professional services are available.
Self-hosted	Windows, macOS, Linux, Self-hosted
Push gateway delivers calls and messages to mobile apps in the background Proxy, presence and B2BUA in one suite All 4 strengths for Flexisip Push gateway delivers calls and messages to mobile apps in the background Proxy, presence and B2BUA in one suite Powers the public linphone.org SIP service Can run on embedded hardware	Runs on hardware from a Raspberry Pi to multi-core servers Handles voice, video and chat All 4 strengths for FreeSWITCH Runs on hardware from a Raspberry Pi to multi-core servers Handles voice, video and chat Long-running project with very active development Optional pairing with SignalWire hosted services
Requires SIP and VoIP knowledge to deploy Conference server is now a separate package	Distributed mainly as source code to build Requires telephony and server administration knowledge All 3 limitations for FreeSWITCH Distributed mainly as source code to build Requires telephony and server administration knowledge Not an end-user chat app
Self-hosted	Self-hosted
Open source	Open source
License: AGPL-3.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Sources for Flexisip linphone.org/en/flexisip-sip-server github.com/BelledonneCommunications/flexisip Catalog checked October 2, 2026	Official website Full listing and sources Sources for FreeSWITCH freeswitch.com Catalog checked September 24, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.