Sometimes I see technical terms that cause me confusion. So it was when I saw Matt (@calltopology) tweet about “Using a GoIP with A2Billing for outbound calls.” My initial reaction was , “WTF is a GoIP? It sounds a bit like a disease.”
Of course, it isn’t a disease. Clicking a little further, I found that Matt has recently been exploring the use of a HyberTone GSM-toSIP gateway device. That company brands their GSM gateways with the rather obtuse “GoIP” monicker. I suppose it was predicated upon FoIP, another persistent term that I find to be something of an abomination.
My own language preferences aside, Matt does a nice job of describing how to setup the GSM gateway with his preferred Asterisk distro and billing solution. What he describes is a bit like the project that I undertook, so long ago now, when integrating a Portech SIP-to-GSM gateway with a local instance of Asterisk.
Back then SIP-to-GSM gateways were still relatively rare. Most of the affordable interface hardware terminated into an analog line jack, requiring an FXO interface to bring it into Asterisk.
It seems that there are a lot more options for SIP-to-GSM hardware, from freestanding boxes line those from Portech, HyberTone or 2N, to Sangoma W400 modular add-in cards for use within an Asterisk server. I see that the single-port GoIP gateway is available from Amazon for $290 or on Ebay, shipped from China, for $117.99.
The price on such things seems to have dropped by over half in the years since I undertook the project. That very fact may bring a single port gateway into the realm of mad money for some users.
It’s been a while since I installed the little Portech MV-370 GSM gateway. It sits in the office IT stack and does what it does. When I’m traveling it lets me call home using my unlimited mobile-to-mobile minutes. It also backs up our IP-based home & office phones. If both the Comcast Cable modem and Covad DSL are out the we can route calls out via T-Mobile.
The Gigaset cordless phones support enough accounts that this is easy, just add #6 to the number to specify dial using the GSM trunk. The GSM gateway is the 6th account on the Gigasets. We don’t even need a local Asterisk system to make it possible.
Remembering back to the installation of the GSM gateway, I converted my T-Mobile account from an individual plan to a family plan, with the gateway device becoming the second line on the account. I dropped my number of minutes but the monthly carrying cost was the same. It seems like a good idea since the use of mobile-to-mobile minutes to call home was going to reduce my need for minutes in the end.
Continue reading “An Unexepected Benefit Of My SIP-to-Cellular Gateway”
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.
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.
Continue reading “Revisiting A GSM Interface For Your Asterisk Server”
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.
Continue reading “Adding A Cellular Trunk To A Home Office VOIP System: Part 2”
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.
Continue reading “How To Add a Cellular Trunk to Your VoIP System: Part 1”
The first part of this week required that I be in Austin, TX working at a customer’s site. This is the sort of trip where I drive to and from as opposed to flying. It’s three hours drive each way, which means listening to XM radio and making phone calls.
A number of times during the period I had to call the UK to consult with associates. As much as possible I tried to do this via the newly installed Portech MV-370 GSM gateway. I’ve made around 20 calls to the UK through the gateway so far.
Remember from our prior installment that have it setup for two-stage dialing, passing incoming cellular calls out through Junction Network’s OnSIP hosted PBX.
Continue reading “Portech GSM Gateway: Observations Based On The First 20 Calls”