If en-bloc sending is used, (i.e.the network can determine that the SETUP message contains all the information required from the user to establish the call) and if the network can determine that access to the requested service is authorized and available, the network shal send a CALL PROCEEDING message to the user. This acknowledges the SETUP message, and indicates that the call is being processed. The network will then enter the Outgoing Call Proceeding state. When the user receives the CALLPROCEEDING message, the user shall also enter the Outgoing Call Proceeding state.
Similarly, if the network determines that are quested service is not authorized or is not available, the network shall initiate call clearing in accordance with 5.3, with one of the following causes:
No. 57 - Bearer capability not authorized;
No. 58 - Bearer capability not presently available;
No. 63 - Service or option not available,unspecified; or
No. 65 - Bearer service not implemented.
NOTES
1. If a supplementary service is not authorized or is not available, the procedure to be used is defined in the supplementary service control procedures.
2. When the network cannot assign a channel due to congestion, the procedures of 5.1.2 shall be followed.