Kamailio — SIP/VoIP (Open Source)

Kamailio is an open-source SIP/VoIP solution. 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 Kamailio?

Kamailio 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. Buyers typically evaluate Kamailio when they need a dependable SIP/VoIP option and want to weigh the trade-offs between free, open-source and paid tools before committing.

Kamailio alternatives

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

AsteriskFreePBXFreeSWITCHFusionPBXWazoopenSIPS

Frequently asked questions

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

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