6 Call Establishment

23.2053GPPBearer-independent circuit-switched core networkRelease 17Stage 2TS

NOTE1: All message sequence charts in this clause are examples. All valid call establishment message sequences can be derived from the example message sequences and associated message pre-conditions.

NOTE2: The continuity indication in the IAM is not used to indicate that a continuity check will be performed on the current leg of the call, but it is used to indicate that a Continuity message can be expected as a result of a continuity check on a preceding ISUP circuit, or establishment of a preceding bearer connection.