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FreePBX — SIP/VoIP (Open Source)

FreePBX is an open-source SIP/VoIP solution from Sangoma. Compare it against 6 other SIP/VoIP tools on FreeSoftwareX — by features, licensing and price — and request a quote or demo free in 2026.

What is FreePBX?

FreePBX is open source — its source code is publicly available and free to use, modify and self-host, usually with an active community and no licensing fees. It is categorised under SIP/VoIP and published by Sangoma. Buyers typically evaluate FreePBX when they need a dependable SIP/VoIP option and want to weigh the trade-offs between free, open-source and paid tools before committing.

FreePBX alternatives

If FreePBX isn't the right fit, compare these SIP/VoIP alternatives side by side:

AsteriskFreeSWITCHFusionPBXKamailioWazoopenSIPS

Frequently asked questions

Is FreePBX free?
Yes. FreePBX is open source and free to use, with no purchase cost for the core product.
What are the best FreePBX alternatives?
Popular SIP/VoIP alternatives to FreePBX include Asterisk, FreeSWITCH, FusionPBX, Kamailio. See the full list of SIP/VoIP on FreeSoftwareX.
What type of software is FreePBX?
FreePBX is an open-source SIP/VoIP tool developed by Sangoma.

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