Asterisk vs Freepbx vs FreeSWITCH

Asterisk, FreePBX, and FreeSWITCH are the three pillars of open-source telephony, but they sit at different layers of the stack rather than being pure…

Asterisk

Free (open source) · From Free

Best for: Developers and integrators who want full control over a customizable open-source telephony engine via dialplan scripting and AGI/AMI/ARI APIs

Freepbx

Open Source / Free · From Free (core software); commercial modules and Sangoma appliances priced separately

Best for: IT admins and MSPs who want a free, GUI-managed business phone system built on Asterisk without writing dialplan by hand

FreeSWITCH

Open Source / Free · From Free

Best for: Engineers building high-concurrency, WebRTC- or video-centric communications platforms who need a lower-level, embeddable telephony engine

At a Glance

	Asterisk	Freepbx	FreeSWITCH
Primary category	Communication	Communication	Communication
Rating	Not documented	Not documented	Not documented
Pricing model	Free (open source)	Open Source / Free	Open Source / Free
Starting price	Free	Free (core software); commercial modules and Sangoma appliances priced separately	Free
Free plan	Not documented	Yes	Yes
Free trial	Not documented	Not documented	Not documented
Platforms	Not documented	Web	Not documented
Team collaboration	Not documented	Not documented	Not documented
AI features	Not documented	Not documented	Not documented
Public API	Yes	Yes	Yes

Standout Differences

The 25-year-old open-source PBX foundation

Asterisk has been the base telephony engine since 1999 and is extensible through its dialplan and AGI, AMI, and ARI APIs, making it the underlying engine that other tools, including FreePBX, are commonly built on top of.

Asterisk

A GUI layer with over a million installations

FreePBX turns Asterisk's text-based configuration into a point-and-click interface, adding call queues, an Endpoint Manager for provisioning SIP phones, and a module marketplace, and it reports powering more than a million business phone system installs worldwide.

Freepbx

Native WebRTC and video built in

FreeSWITCH supports SIP over WebSocket and WebRTC natively and adds MCU-style video conferencing and transcoding, positioning it ahead of many competing engines for browser-based real-time communications.

FreeSWITCH

Designed for carrier-grade scale

FreeSWITCH's architecture is documented as suited to handling large volumes of concurrent calls, from a Raspberry Pi to multi-core data center servers, making it a common choice as an embedded engine inside commercial VoIP and contact-center platforms.

FreeSWITCH

All free, self-hosted, with a commercial steward behind them

Every core engine is free and open source with no license fees. Asterisk and FreePBX are stewarded by Sangoma Technologies, while FreeSWITCH is stewarded by SignalWire, founded by FreeSWITCH's original creators, giving each project a well-resourced commercial backer without forcing a paid tier on self-hosters.

Asterisk, Freepbx, FreeSWITCH

Feature-by-Feature

Administration

Feature	Asterisk	Freepbx	FreeSWITCH
Built-in graphical admin interface	Unavailable	Available	Unavailable
Call queues with agent management	Not documented	Available	Not documented
Endpoint or phone provisioning management	Not documented	Available	Not documented

Protocols and Scale

Feature	Asterisk	Freepbx	FreeSWITCH
Native WebRTC support	Not documented	Not documented	Available
Video conferencing and transcoding	Not documented	Not documented	Available
Documented for carrier-grade, high-concurrency scale	Not documented	Not documented	Available

Support and Extensibility

Feature	Asterisk	Freepbx	FreeSWITCH
Commercial or professional support option available	Not documented	Available	Available

Pricing Compared

Starting price reflects the lowest paid tier, not the full cost for every team size or usage level.

Asterisk

No individual plan breakdown documented yet.

Freepbx

FreePBX Core (Open Source) — Free N/A

Commercial Modules — Varies by module One-time or subscription, per module

PBXact (Sangoma commercial) — Contact for pricing Custom

FreeSWITCH

Open Source Core — Free N/A

FreeSWITCH Advantage (SignalWire) — Contact for pricing Custom

SignalWire Cloud Platform — Usage-based, contact for pricing Pay-as-you-go

Pros & Cons

Asterisk

Pros

Free and fully open source with no licensing fees
Highly extensible and customizable for bespoke telephony needs
Large, long-running community and ecosystem (25+ years)
Works with a wide range of SIP trunking providers and telephony hardware

Cons

Requires Linux and telephony expertise to install, configure, and secure
No built-in graphical interface (commonly requires FreePBX or similar)
Self-hosting means the operator owns all maintenance and security responsibility

Freepbx

Pros

Core software is completely free and open source with no license fees
Backed by Sangoma, a publicly traded company, giving it long-term development stability rare among open-source projects
Powers over a million installations, meaning extensive community documentation, forums, and third-party expertise are available
Can run on modest, inexpensive hardware for small deployments
Optional commercial modules and PBXact give a clear upgrade path to professional support without forcing it on free users

Cons

Requires Linux system administration knowledge to install, secure, and maintain
Officially supported only on Debian Linux, limiting deployment flexibility for other distributions
Some genuinely useful features, like advanced endpoint management, are gated behind paid commercial modules
Telephony and VoIP configuration (SIP trunks, NAT traversal, codecs) has a steep learning curve for non-specialists
No official cloud-hosted SaaS version directly from the FreePBX project itself, requiring self-hosting or a third-party host

FreeSWITCH

Pros

Completely free and open source with no license fees for self-hosted use
Battle-tested, carrier-grade architecture used underneath many commercial VoIP and contact center platforms
Strong native WebRTC and video support, ahead of many competing telephony engines historically
Backed by a well-resourced commercial steward, SignalWire, founded by the project's original creators
Runs on a wide range of hardware, from low-cost single-board computers to large multi-core servers

Cons

No built-in administrative GUI, dashboard, or provisioning system out of the box
Requires significant telecom and systems engineering expertise to deploy into a production-ready system
Steeper learning curve than GUI-based alternatives like FreePBX for basic PBX-style use cases
No official free managed hosting; commercial support and cloud options are priced on request
Documentation and community resources, while substantial, can be less beginner-friendly than more polished commercial platforms

Use Cases

Choose Asterisk: Developers and integrators who want full control over a customizable open-source telephony engine via dialplan scripting and AGI/AMI/ARI APIs

Choose Freepbx: IT admins and MSPs who want a free, GUI-managed business phone system built on Asterisk without writing dialplan by hand

Choose FreeSWITCH: Engineers building high-concurrency, WebRTC- or video-centric communications platforms who need a lower-level, embeddable telephony engine

Asterisk

Custom PBX deployment — Businesses build in-house phone systems tailored to their call-routing needs.
VoIP platform development — Providers build commercial calling and conferencing platforms on top of Asterisk.

Freepbx

Small business phone systems — IT administrators deploy self-hosted FreePBX servers to run a full-featured business phone system without per-user SaaS licensing fees.
Managed service provider deployments — MSPs and telecom integrators deploy and support FreePBX or PBXact systems for multiple client businesses using Sangoma hardware and commercial modules.
Home-lab and hobbyist telephony — Telecom hobbyists run FreePBX on inexpensive hardware to learn VoIP administration or manage a personal or small-office phone system.

FreeSWITCH

Carrier-grade communications platforms — Telecom companies and platform builders use FreeSWITCH as the media-handling and call-control core of large-scale voice and video communications products.
WebRTC application backends — Developers use FreeSWITCH's native WebRTC support to power browser-based voice and video calling features inside web and mobile applications.
Custom PBX and contact center systems — Systems integrators build bespoke PBX and contact center solutions on top of FreeSWITCH when they need more flexibility than a GUI-based platform like FreePBX provides.

Frequently Asked Questions

What's the actual difference between Asterisk and FreePBX?

FreePBX is not a competing telephony engine; it is a free, web-based graphical management interface built on top of Asterisk. Choosing FreePBX means you get Asterisk's engine underneath plus a point-and-click GUI for extensions, trunks, IVRs, and call queues instead of hand-editing dialplan files.

Which is best for a small business that wants a phone system without deep telephony expertise?

FreePBX is the most approachable of the three because it wraps Asterisk's configuration in a GUI, and its documented hardware guidance shows it can run a small deployment on a modest server with about 4GB of RAM.

Which is best for WebRTC or video-heavy communications apps?

FreeSWITCH is the strongest documented fit, with native SIP-over-WebSocket and WebRTC support plus MCU-style video conferencing and transcoding built into the engine.

Do any of these three cost money?

All three core engines are free and open source with no license fees. FreePBX has optional paid commercial modules and Sangoma's PBXact for professional support, and FreeSWITCH has SignalWire's optional Advantage support plan and usage-based cloud platform; neither requires payment to run a functional system.

Is FreeSWITCH a drop-in replacement for Asterisk plus FreePBX?

Not out of the box. FreeSWITCH is documented as a bare telephony engine with no administrative dashboard, provisioning system, or billing tools, so replicating what Asterisk plus FreePBX delivers out of the box requires building or buying that administrative layer separately.

Which requires the least Linux and telephony expertise to run?

All three require self-hosting and Linux systems knowledge, but FreePBX reduces the telephony-specific learning curve the most since its GUI handles dialplan generation; Asterisk and FreeSWITCH both expect comfort with text-based configuration and, for FreeSWITCH, additional engineering work to reach a production-ready system.

Read the full Asterisk review · Read the full Freepbx review · Read the full FreeSWITCH review

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