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Asterisk — SIP/VoIP (Open Source)

Asterisk 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 Asterisk?

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

Asterisk alternatives

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

FreePBXFreeSWITCHFusionPBXKamailioWazoopenSIPS

Frequently asked questions

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

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