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 <[EMAIL PROTECTED]> 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?
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