[Arm-dev] VoIP FXS port?

Does anyone know of an VoIP FXS port other than the one for Raspberry PI:

http://www.raspberrypi.org/forums/viewtopic.php?f=45&t=86601&p=71602...

Or if this will work on other boards like my Cubies?

One of the targets I have for C7-arm is a PBX and support for a fax machine to efax is a critical component particularly with the detarrifing of PSTN coming in the next few months (well rule making by FCC, we will see what each state does).