Mobile to Mobile Call, Network messages

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Murali - 13 Jul 2005 03:15 GMT

When two subscribers A and B are currently in a MSC X. A belong to
PLMN-A and B belong to PLMN-B. Both A and B have made and received
calls while in the same MSC X just a moment ago. If A calls B, will
MSC-X routes the calls to GMSC of PLMN-B and then GMSC routes the call
back to MSC-X?

Since the subscriber B already registered in MSC-x and made calls and
received calls earlier, can't MSC-X figure out that the subscriber B is
in the same MSC and deliver the call without any network messaging with
HLR or routing to GMSC?

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matt weber - 14 Jul 2005 00:11 GMT

>When two subscribers A and B are currently in a MSC X. A belong to
>PLMN-A and B belong to PLMN-B. Both A and B have made and received
[quoted text clipped - 6 lines]
>in the same MSC and deliver the call without any network messaging with
>HLR or routing to GMSC?

It certainly can. I have seen it a few times in the UK with an Optus
or Telstra (both Australian SIMS). The network is indeed aware of
what roamers are currently registered on the network, and routes calls
accordingly.

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