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ISUP instead of MAP

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  • #58988 Reply
    F. Olivares
    Guest

    actually in GSM network, the GMSC identifies the subscriber’s HLR based upon the MSISDN using MAP protocole (Send Routing Information (SRI))to get the IMSI of subscriber. My question is if is it possible to use ISUP v4 instead of MAP to get the IMSI of the subscriber from his MSDIDN ?

    Thank you in advance!

    F.OLIVARES

    #58989 Reply
    Wallis Dudhnath
    Guest

    MAP and ISUP are different protocols.

    ISUP is used to establish a TX path using a defined CIC (Time Slot
    connection). MAP is used for Non-Circuit Related signalling.
    For your case a request to the HLR is made via a SRI request.
    So that HLRs can scale there is a SRF (signalling Relay Function) that
    is generally a standalone node or integrated with the GMSC or the
    STP Network. This allows HLRs to scale and removes the earlier issues of
    batching MSISDN / IMSIs to a specific HLR.

    MAP has been designed to use the MSISDN to the HLR. The HLR intern will
    map the MSISDN to IMSI for Profile Information, Service Flags (CAMEL, SS, etc..),
    Serving VLR, Location, etc..

    For your case ISUP cannot be used as it have been designed to setup a “nailed up”
    connection.

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