Deploy SIP for FreeSWITCH™

The SIP.US trunking service is compatible with several free, open source PBX solutions including FreeSWITCH. By implementing SIP for FreeSWITCH you can reduce the cost of your communications infrastructure and take advantage of the flexibility and customization the combined solutions offer.

Supported Products

About FreeSWITCH

FreeSWITCH is an open source, free platform for the creation of voice and unified communications applications. It is capable of being embedded into other projects, or being used as a stand-alone application.  FreeSWITCH enables many telephony applications, including call control and IVR functionality.  FreeSWITCH is available for source compilation on Unix and Linux distributions as well as Windows.

sip service provider

Implementing FreeSWITCH

FreeSWITCH™ has a modular design that allows it to be extended without impacting its function or requiring a large development effort. Each module does something specific and  often related tasks are grouped into one module. You will need to enable the modules that you would like based on their function.  FreeSWITCH comes with a set of modules loaded, to enable most basic functionality.  Complete documentation is available to walk you through the implementation.  For those less familiar with telephony and software implementation, paid consulting and support are available.

Why Choose SIP.US for FreeSWITCH?

Two primary components make up a business phone system. The first is the software that handles call control and other phone system features such as conferencing, voicemail, automated attendants and others. This is often referred to as the PBX. FreeSWITCH plays the role of the PBX. The second necessary component is a way to deliver calls to the network that routes them to their intended recipient. This network is called the PSTN (public switched telephone network). In a traditional phone system, carrier provided PRI (primary rate interface) lines connect the PBX to the PSTN. SIP is an alternative that uses data lines, rather than telephone lines to make the connection. Customers choose to deploy SIP for FreeSWITCH using SIP.US to gain a variety of benefits:


  • Using SIP.US with FreeSWITCH is usually much less expensive than traditional telephone lines
  • Traditional PRI lines are sold in groups of 23 channels. SIP.US allows customers to subscribe to as few as one channel at a time, giving customers the flexibility to pay for only what they need now
  • Although some SIP trunking providers require clients to purchase Internet connectivity from them, SIP.US does not. Our clients choose the Internet bandwidth provider that makes the most sense for their needs and budget
  • SIP.US comes with a powerful, easy-to-use online interface for administration of your SIP trunk
  • We utilize only Tier-1 upstream providers to route our traffic, giving our customers the most reliable network available
  • SIP.US has been thoroughly tested with FreeSWITCH. They are used together in deployments across the US.


How To Set Up SIP for FreeSWITCH

Setting up your SIP.US trunk configuration for FreeSWITCH is easy.  Visit our knowledge base for detailed instructions.  If you have any trouble with your configuration, simply open a support ticket.  We are here to help.

Why not start your trial today and begin saving time and money with our cost saving, easy-to-manage, complete SIP solution?

Get Your Free SIP TRUNK in 60 Seconds.


Any broadband Internet connection will work with SIP.US and FreeSWITCH.  Choose from DSL, T1-data, cable or Metro Ethernet.  SIP.US gives our clients the flexibility to choose the Internet connectivity option that is best for them and unlike many SIP providers, we do not require customers to purchase Internet access from us.

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