Global Title Routing in Mobile Networks
See also: Mobile Application PartIn mobile networks, there are database queries such as "how can I tell if this subscriber is really who he says he is" (MAP_Send_Authentication_Info) which have to be routed back to the database which holds the subscriber's information (the HLR, or in this case, the AUC).
Unfortunately, at the time the subscriber first arrives, we don't know which HLR is the subscriber's HLR. For this reason, the queries have to be routed on the subscriber's identity (IMSI) is used to generate the called party address in the message. How this is done depends whether we are in world area 1 (North America) or somewhere else.
There are three types of GT in use in mobile networks known as E.164 (MSISDN), E.212(IMSI) and E.214(MGT):
- E.164(MSISDN) = CC+NDC+SN, e.g. 91-98-71405178
- E.212(IMSI) = MCC+MNC+MSIN, e.g. 404-68-6600620186 (MTNL delhi)
- E.214(MGT) = combination of E.212 and E.164 (Exact combination is defined in the operators IR21 document)
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