I am new to this forum but appreciate all the quality information and knowledge from members. I am hoping there is someone out there that can help me with a question I have regarding a project I am currently working on. I am looking to understand how HLRs are identified on SS7 routing network, based on the IMSIs the store.
At a high level the project I am working on is the interconnection of an external HLR (lets call it HLRx) into an existing operators network.
As I understand it this HLRx will need to appear as a new network element within the operators existing SS7 network (ie have its own GT address for signaling routing). But this HLR will contain subscriber information for a subset of the operators IMSIs range (we are an MVNO, integrating our own HLR, and using an sub-range of the operators IMSI range) i.e sub-range could be:
40468 5500000000 to
So during the LU procedure (or any call setup procedure) the operators signaling network will need to address HLRx's GT for this sub-range of IMSIs, so as to retrieve subscriber information. Can someone please inform me how this is achieved? Is it that this sub-range if IMSIs is held in a reference table maintained within SCCP GT Tables for example?
I hope I have explained my situation accurately, any help would be greatly appreciated!
Thanks and regards