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

[C F]

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?
>
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