SIP for FreePBX

Implementing SIP for FreePBX®

The SIP.US trunking service is completely compatible with the FreePBX® open source PBX solution.  Businesses choose to use SIP.US along with FreePBX® because of the flexibility, reliability and cost savings that they enjoy.

Supported Products

About FreePBX®

FreePBX® is an open source business phone application that is available without charge. It was created and is maintained by a community of developers and others who are dedicated to making sophisticated phone system software that is easy to use and useful. The software has been downloaded more than 5 million times. FreePBX® is sponsored by individuals and companies who are dedicated to the vision of a free, easily implemented business phone solution. Schmooze Com Inc. is the Principal corporate sponsor and they offer a commercially supported version of FreePBX®. FreePBX® enjoys strong relationships with Digium, the sponsors of Asterisk.

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Implementing FreePBX®

FreePBX® has been built by a community of software developers and telco experts.  Although it is designed to be easy-to-implement, customization of the solution requires a good knowledge of script programming, telephony and networking.  Thorough documentation and various paid support and professional services packages are available. For those who prefer a pre-packaged solution, there are several to choose from so that you can take advantage of the ease and flexibility of the solution.

Why Choose SIP.US for FreePBX®

Every phone system needs PBX (private branch exchange) software that handles things like call management, voicemail, call distribution groups, automated attendants and the rest. FreePBX® provides this functionality. In addition a phone system needs at least one phone number and access to the network that routes calls to numbers outside of the system. This is called the Public Switched Telephone Network or "PSTN." Traditionally, businesses used carrier provided PRI (primary rate interface) lines to send calls to the PSTN. With SIP, calls reach the PSTN through a data network rather than traditional telephone lines. Customers choose to deploy SIP for FreePBX® using SIP.US for several compelling reasons:


  • A significant cost savings can be gained by deploying SIP.US vs. traditional telephone lines
  • Customers enjoy the flexibility that SIP.US provides by allowing the purchase of one channel at a time. (Traditional PRI lines are sold in bundles of 23 channels.) With SIP.US customers pay only for what they need and can expand on-demand.
  • SIP.US does not require customers to purchase Internet bandwidth from us, allowing them to choose the most cost effective and reliable network in their area.
  • SIP.US offers additional features, including a powerful, yet simple control panel for administration, excellent International calling rates and real-time call data records.
  • In order to ensure quality and reliability, SIP.US leverages a Tier-1 redundant network
  • SIP.US is used along with FreePBX in deployments across the country


How To Set Up SIP for FreePBX®

The SIP.US Module makes it easy to configure your SIP trunks, outbound route and inbound routes for SIP.US DIDs within FreePBX®.  Just visit our knowledge base for a step by step configuration guide.

FreePBX® is a Registered Trademark of Schmooze Com, Inc.

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SIP for FreePBX® FAQs

SIP.US works with any broadband Internet connection including; Metro Ethernet, DSL, cable or TI-data. Although some SIP providers require customers to get Internet connectivity from them, we do not and you are free to choose the least expensive, fastest and most reliable connection available to you.

Customer Feedback

Here is what our customers have to say about working with SIP.US.

Simple Interface.

We were able to get our systems up and running with SIP.US in a matter of minutes using the simple online interface.

Matt Harrison

Elevate Audio Visual

Low cost and good!

It’s easy to be low cost, but it’s a lot harder to be low cost AND good! In my opinion, SIP.US should be on anyone’s short list of primary providers.

Michael Dodds


All the tools I need.

The SIP.US Control Panel gives me all the tools I need to add, change and delete phone numbers. I can even order all the DIDs I need and set them up instantly. I love having access to these self-service tools, but I know the support team is also there if I need additional help.

Colin Cook

Thimble River

Up and running in minutes.

We are able to get our Switchvox systems up and running with SIP.US in a matter of minutes using the simple online interface.

Mike Crockett

BITS Technology

Quality support, low price.

I wasn’t sure how to configure my Asterisk system to work with SIP.US. The SIP team was able to remotely access my system and set it up for me. I didn’t expect that level of support for such a low price.

Greg Galvin

The Galvin Law Group

Fast and easy set-up.

I don’t have any experience with SIP trunking, but connecting my Asterisk PBX to SIP.US was fast and easy.

Eddy Pareja

Sangfroid Web Design

Excellent support.

The reason we moved most of our VOIP to you is because of your excellent support. We moved from another provider but your support makes the extra money well worth it.

Brian Marshman

CEO BMI SmartCloud