gsm

Revisiting A GSM Interface For Your Asterisk Server

Some time ago @Boxdog pointed me to a uCPBX in Bulgaria. They are reselling various small Asterisk systems based upon the Astfin project. They have a few variations on the IP04, including an 8 port variant (IP08 = 8 FXOs) as well as 1 or 4 port BRI capable versions.

ucpbx-astfin-br4-back

The design of the base system supports adding interface ports through the use of little daughter cards. I believe that their daughter cards are compatible with Digium’s TDM-400P card. The cards even use the standard DAHDI driver making installation especially easy.

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Adding A Cellular Trunk To A Home Office VOIP System: Part 2

Originally published June 6, 2008 at www.smallnetbuilder.com

Welcome back! In Part 1, I took you through the thought process that led me to want to add cellular-based access to my home’s VoIP system. I ended up with the following project goals:

  • Ensure the ability to make outgoing calls should our DSL fail
  • Provide access to 911 service
  • Provide access to 411 service
  • Provide a low/no cost way to stay in touch when I’m traveling
  • Provide a means of making oversea calls from my cell phone without paying cellular carriers oversea long distance rates

In this second and final part, I’ll focus on the little box that makes it all possible.

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How To Add a Cellular Trunk to Your VoIP System: Part 1

Originally published May 9, 2008 at www.smallnetbuilder.com

Our Asterisk based home/office phone system provides tremendous flexibility in handling our phone calls. It gave us the opportunity to migrate away from using analog phone lines from a traditional carrier. We now send and receive all calls via IP over our DSL. Of course, the monthly cost of our calling is a lot less. However, it’s not a prefect system – yet.

From the outset, we have worked to make the system more robust. This we have done in many ways, including providing various redundancies in hardware and configuration. Most recently, we have added a cellular trunk to ensure calling capability should our DSL service fail. The process involved in arriving at this decision has proven interesting.

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