Hello, dear!
PROCESS_UNSTRUCTURED_SS_REQUEST include "PROCESS_UNSTRUCTURED_SS_REQUEST_CNF" and "PROCESS_UNSTRUCTURED_SS_REQUEST_REQ".
The MAP_PROCESS_UNSTRUCTURED_SS_REQUEST_REQ message is a USSD request message. It is used to transmit information between the MMTel AS and the HLR and then between the HLR and the USSD center to allow USSD service requests.
The MAP_PROCESS_UNSTRUCTURED_SS_REQUEST_CNF message is a USSD message in response to the MAP_PROCESS_UNSTRUCTURED_SS_REQUEST_REQ message. It contains the USSD operation result information.
For details, see "PROCESS_UNSTRUCTURED_SS_REQUEST_CNF" and "PROCESS_UNSTRUCTURED_SS_REQUEST_REQ".
Best wishes!