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

Michael Welter mike at telecommatters.net
Mon Mar 12 18:02:51 MST 2007


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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