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FusionPBX

Free, open-source multi-tenant PBX built on FreeSWITCH, for VoIP providers and IT teams that self-host phone systems. Paid memberships from $100/mo.

Our take: FusionPBX is a good fit when you have Linux skills and want to host phone service for many tenants without per-seat fees.

Best forMulti-tenant hosted PBX
ReviewedPricing: Free
6.9 out of 105 criteria · see breakdown
Try FusionPBXFree; memberships from $100/mo (1-year term)

FusionPBX is free, open-source PBX software that adds a web interface and call features to the FreeSWITCH telephony engine, with multi-tenant hosting built in. It is for VoIP providers, MSPs and IT teams that can run their own Linux servers. The software costs nothing; optional memberships with training and support run $100 to $1,000 a month on a 1-year commitment.

The bottom line

Excellent value for skilled VoIP teams; not for businesses wanting a managed phone line.

Our score

Reviewed by the Conversion Gems editorial team. Hover a facet to focus it; click to pin.Tap a facet to focus it.

What it is, and why we rate it

One line each. Open a row for detail.

What it really isFree, self-hosted PBX software: a web interface and apps that turn FreeSWITCH into a multi-tenant phone system.
Our takeFusionPBX is a good fit when you have Linux skills and want to host phone service for many tenants without per-seat fees.
Budget for the hidden cost: official support only comes with a $300+ monthly membership on a 12-month term.
Why we rate itIt delivers carrier-style, multi-tenant PBX features for free and is still released regularly.
The catchSelf-hosting skills are required, and paid support needs a 12-month membership.

Best / not good for

Best for
  • VoIP providers hosting many customers
  • MSPs reselling phone service
  • IT teams avoiding per-seat phone fees
Not good for
  • Small offices without Linux skills
  • Teams wanting a vendor-managed phone service
Trade-offs

Friction report

Trade-offs to know before signing up.

  1. Time to value
    Hours to days: script install on Debian is quick, but trunks, dialplans and security take expertise.
  2. Scale breakpoint
    When you need official support or the REST API, memberships start at $300 to $500 a month.
  3. Walled garden
    Low: open source, standard SIP, your own servers and data.
Still a fit?
If none of these block you, start on the free plan.
Try FusionPBX

FusionPBX software and membership prices

OptionPriceSupportIncludes
FusionPBX softwareFreeCommunity (docs, IRC)Full PBX under the Mozilla Public License 1.1; self-hosted
Green membership$100/monthNoneTraining videos, member docs, rebranding, Send Email and Domain Backup apps; 1 person; up to 5 servers
Blue membership$300/monthUp to 1.5 hours a monthGreen plus Conference CDR and Call Center Notify; up to 10 servers
Purple membership$500/monthUp to 3 hours priority a monthBlue plus call center wallboard, summary, announce and callback apps, JSON REST API; up to 15 servers
Gold membership$1,000/monthUp to 6 hours priority a monthPurple for up to 3 employees; up to 30 servers

From FusionPBX's members page, checked 4 October 2026. All memberships require a 12-month commitment. License from the source files on GitHub.

FusionPBX vs FreePBX vs Aircall

FusionPBXFreePBXAircall
Engine or modelFreeSWITCH, self-hostedAsterisk, self-hostedHosted cloud service
Software priceFreeFreeFrom $30/license/month billed annually, 3-license minimum
Paid supportMemberships from $300/month (1-year term)From $399/year per system (Sangoma)Included with plan
Who runs the serversYouYouAircall

From fusionpbx.com (checked 4 October 2026), freepbx.org and sangoma.com via our FreePBX research (checked 2 October 2026), and aircall.io/pricing (checked 4 October 2026).

Frequently Asked Questions

Is FusionPBX free?

Yes. The software is free to download and use. Paid memberships are optional and cost $100, $300, $500 or $1,000 a month with a 1-year commitment (checked 4 October 2026).

Is FusionPBX open source?

Yes. Its source code is on GitHub, and the files are licensed under the Mozilla Public License 1.1.

Which is better for me, FreePBX or FusionPBX?

FusionPBX suits providers hosting many separate customers on shared servers, since multi-tenancy is built in, and it runs on FreeSWITCH. FreePBX is a web interface for Asterisk with paid support from Sangoma. Pick the engine your team already knows.

Is FreeSWITCH a PBX?

FreeSWITCH is the telephony engine underneath. FusionPBX's docs describe FusionPBX as the web interface that turns FreeSWITCH into a configurable PBX with extensions, voicemail and call center features.

How do I upgrade FusionPBX?

In the web interface go to Advanced, then Upgrade, which updates the source code, database structure, menus and permissions. You can also run git pull in /var/www/fusionpbx from the command line, per the official docs.

What does a FusionPBX membership include?

Green ($100/mo) gives training videos, member docs and extra apps with no support. Blue ($300/mo) adds up to 1.5 hours of support a month, Purple ($500/mo) up to 3 hours plus the JSON REST API, and Gold ($1,000/mo) up to 6 hours for up to 3 employees.

FusionPBX alternatives

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Sources checked October 4, 2026: FusionPBX homepage, FusionPBX memberships, FusionPBX download and install, FusionPBX on GitHub, FusionPBX docs.

Conversion Gems independently reviews every tool.

Tags

#VoIP#OpenSource#PBX#FreeSWITCH

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