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Common ID message

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  • #69517

    Dear all,
    In a MOC procedure, could plz tell me why the MSC needs to send Common id to BSC ? and why it contains the IMSI of the MS ?


    I have this explanation : After sending the CM SER Req and doing the security and authentication procedure. The MSC will send a common ID in which there is the IMSI to the BSC. The bsc will use this message to check and verify the identity of the MS. I hope that this is the right answer.


    hi jason,

    unfortunately, your answer is probably not correct : all security checks are perform by the core network only (HLR/EIC)

    The BSC has one reason to need the IMSI : it’s to be able to perform the Paging Coordination.

    There might be other reason, but i cant find any. So I suspect that this sending of the IMSI is rather recent in networks (let’s say 4 or 5 yrs)


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