New answers tagged mobile
If you want a canonical answer, I think you may need to go to the various standards that define the cell phone network, such as ITU-T, 3GPP, UMTS, etc. They're not light reading and some of them are fairly expensive to obtain. My understanding is that in classic GSM/3G/ISDN/UMTS/etc. call initiation, there is very little metadata beyond the dialed phone ...
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