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IMSI detach

  • This topic has 2 replies, 1 voice, and was last updated 9 years ago by wallis dudhnath.
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  • #69419

    Dear All,

    how the MSC knwo that the subscriber is absent in case the SMSC send an Forward Short message to the absent subscriber (mobile switched off or Battery removed)

    Many thx


    any one can help me?

    wallis dudhnath

    IMSI detach happens when a mobile is switched off. A MAP request is sent to the HLR to reflect “IMSI-detach”. HLR profile is updated. Once the mobile is back online (IMSI attach) the SMS-SC will forward the SMS message.

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