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3CX Free Basic vs FusionPBX: catalog facts
3CX Free Basic	FusionPBX
Freemium Free for up to 10 users and 4 simultaneous calls; larger editions are paid.	Free Free to download and run on your own server.
Self-hosted	Web, Self-hosted
No licence cost for small teams Runs on your own infrastructure	Multi-tenant PBX managed from a web interface Covers call center, fax, voicemail and conferencing
Limited to 10 users and 4 simultaneous calls Proprietary software	Requires running and maintaining your own FreeSWITCH server Aimed at administrators with telephony knowledge
Self-hosted	Self-hosted
Closed source	Open source
License not stated	License not stated
Not stated if an account is 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 23, 2026	Official website Full listing and sources Checked September 23, 2026

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