[asterisk-biz] GSM cellular network (Global System Mobile)

[Michael Welter]

I'm looking for a way to send a few data packets over the GSM voice 
channel without having to subscribe to GPRS service.  Can this be done?

Thanks

C F wrote:
> Of course thru signalling.
> 
> On 3/12/07, Michael Welter <mike at telecommatters.net> wrote:
>> Does anyone know how CallerID is passed to a GSM cell phone?  Is the
>> audio channel used?  Or the signalling layer?
>>
>> Even though the phone's codec is optimized for speech, is it possible to
>> use FSK (frequency shift keying) through the codec?
>>