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Reply To: SMS

#54557
Pan
Guest

I think, that non-call assotiated supplementary services (e.g. Call Forwarding operations) are activated, deactivated, interrogated etc. on SDCCH. But invocation Call Hold during the call is transfered on SACCH. Call Waiting Tone is standart supervisory tone and more likely than not is generated in MS on basis of signals (SACCH) from the network.