04.933GPPCompletion of Calls to Busy Subscriber (CCBS)Stage 3TS
MS A shall send a REGISTER message to the network, with the Facility information element, indicating ProcessUnstructuredSS-Request. Different MMI is required (as specified in GSM 02.30) for the three different deactivation operations, although each deactivation operation uses the USSD mechanism to transport the information to the network.
MS A NETWORK
Figure A.3: Deactivation of all CCBS requests, the last or a single CCBS Request for non supporting MSs