From: Michael Welter
>
> Does anyone know how CallerID is passed to a GSM cell phone? Is the
> audio channel used? Or the signalling layer?
Caller ID display is handled at the signalling level on GSM networks.
> Even though the phone's codec is optimized for speech, is it possible
> to use FSK (frequency shift keying) through the codec?
Cannot help you here.
Sincerely,
Trevor Hammonds
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