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Flexisip vs Asterisk: catalog facts
Flexisip	Asterisk
Best for: Running your own SIP VoIP service, especially for Linphone mobile users	Best for: Administrators building a self-hosted phone system
Free Free under the AGPL 3.0, with a paid proprietary licence for closed-source use.	Free Free and open source.
Self-hosted	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	Run your own PBX and VoIP system Flexible enough to build custom telephony setups All 3 strengths for Asterisk Run your own PBX and VoIP system Flexible enough to build custom telephony setups Open source with no license fees
Requires SIP and VoIP knowledge to deploy Conference server is now a separate package	Configuration requires telephony knowledge A framework to build on rather than a ready-to-use phone system
Self-hosted	Downloadable app, 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 Asterisk asterisk.org Catalog checked September 24, 2026

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