Telecom Routers Switches Question:
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What is causing Location Update(LU) delay when a roamer try to latch to a visited network?

Answer:

Due to various reasons for Lu problems:
1.Routing of GT mismatch at Visited network/visited MSC
2.IMSI analysis want to given properly in all the vis MSC's
3.Verify IMSI,IMSIINDICATOR,TON,NRD,SRD,SAD,DIA,PLMN NAME
4.No traffic is given current point code,where GT configured
5.HLR defintion at Home plmn country is wrong
6.HLR end not allowed given PLMN in roaming profile
7.HLR end GT mismatch
8.customer not having sufficient roaming services
9.customer not having authentication
10.customer handest's network id is disabled

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