22.9.2 Procedure in the MSC
29.0023GPPMobile Application Part (MAP) specificationRelease 17TS
The process invokes a macro not defined in this clause; the definition of this macro can be found as follows:
Check_Confirmation see clause 25.2.2.
The A_PROCESS_UNSTRUCTURED_SS_REQUEST from the MS contains information input by the user; the message may be fed to an application contained locally in the MSC or to the VLR. The rules for determining this are specified in 3GPP TS 23.090 [34].
1) Message Destined for the VLR
If the message is destined for the VLR then the MSC shall transfer the message to the VLR using the mapping specified in detail in 3GPP TS 29.011 [59].
2) Message Destined for the Local Application
If the message is destined for the local USSD application then the MSC shall transfer the information contained in the message to the application.
The process in the MSC is shown in figure 22.9.2/1.