A.3 Subclause 6 Exception procedures or unsuccessful outcome

22.0913GPPExplicit Call Transfer (ECT) supplementary serviceStage 1TS

In the case where:

– the two calls are incompatible with ECT (either one of them or both are not Telephony service);

– the call state is not compatible with the request, e.g. one call is not answered;

– etc. (for further study).

the request will be rejected by the network and the subscriber will be notified of the cause.

NA1 states: It is the responsibility of the served user to ensure that the two calls are compatible.