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.
This little GSM card is being offered for 150 Euro which is around$220 USD. At that price it’s marginally cheaper than the Portech MV-370 that I bought last year, presuming that you already have the TDM-400P card. If you have to buy both then the Portech box is cheaper.
There’s a certain elegance about having the GSM interface right inside your Asterisk system. No extra power supply or network wiring to worry about. That makes for a very clean, reliable installation.
I still think that a cellular gateway is a solid approach to having an emergency trunk when you don’t have any POTS lines to your location. You can use it to provide 411 and 911 service, and leverage that offer of a zillion free “mobile-to-mobile” minutes when calling to other cell phones.
Of course, I’ve written about all this before.