[Asterisk-Users] FRS / FRS/GMRS 2-way radios as SIP clients

[Glenn Powers]

I'd also suggest looking into the GNU Radio Project.
It's an open source Software Defined Radio (SDR).
It's a R&D project, but it's making good progress.

http://www.gnu.org/software/gnuradio/

"Software radio is a revolution in radio design due to its ability to 
create radios that change on the fly, creating new choices for users. At 
the baseline, software radios can do pretty much anything a traditional 
radio can do. The exciting part is the flexibility that software 
provides you. Instead of a bunch of fixed function gadgets, in the next 
few years we'll see a move to universal communication devices. Imagine a 
device that can morph into a cell phone and get you connectivity using 
GPRS, 802.11 Wi-Fi, 802.16 WiMax, a satellite hookup or the emerging 
standard of the day. You could determine your location using GPS, 
GLONASS or both."

cheers,
glenn