22.9.4 Procedure in the HLR
29.0023GPPMobile Application Part (MAP) specificationRelease 17TS
The MAP process invokes macros not defined in this clause; the definitions of these macros can be found as follows:
Receive_Open_Ind see clause 25.1.1;
Receive_Open_Cnf see clause 25.1.2;
Check_Confirmation see clause 25.2.2.
The MAP_PROCESS_UNSTRUCTURED_SS_REQUEST from the VLR contains information input by the user. If the alphabet used for the message is understood then the message shall be fed to an application contained locally in the HLR or to the gsmSCF or to a secondary HLR where the USSD application is located.
1) Message Destined for the Local Application
If the message is destined for the local USSD application then the HLR shall transfer the information contained in the message to the local application.
2) Message Destined for the gsmSCF or the secondary HLR
If the message is destined for the gsmSCF or the secondary HLR then the primary HLR shall transfer the message transparently to the next node.
The process in the primary HLR is shown in figure 22.9.4/1.