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

[TC]

Any one know of software that allows 2-way radios as VoIP(SIP) clients,
besides dingotel's usb & mic cable trick ?
http://www.dingotel.com/2way/requirements2way.asp

They might be ok if the SIP client was not hardcode to their own SIP proxy
Has anyone tried any hacks to get the 2-way radio SIP client to regsiter to
a * box.

hmm chan_frsgmfrs anyone? using the usb/mic cable under linux :)