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PSI(provide subscribe information)

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  • #40630 Reply
    Jinhua Dong

    hi, all

    you know, when a mobile user is called in GSM, his HLR will send PRN message to MSC which the user is roaming for a MSRN, and do you know
    when a PSI (Provide subscribe Information) message is needed?
    and how does the HLR know that PSI is need to send to VLR?
    how does HLR tell the calling MSC the responded information from called MSC, by SRI_ACK?

    #40631 Reply

    The HLR sends PSI when receives a ATI
    msg (any Time interrogation). These msg it is not a message to route call , it is used to location procedures (The origen can be another externa system not only a MSC/VLR) and the HLR return informatión such as Cell id , State (Busy, idle, det) and time of location .In general the destination VLR doesn,t return a MSRN so PSI procedure can not be used instead PRN procedure

    #40632 Reply

    Hi Santi and Dong,

    I never seen these PSI and ATI Messages anywhere ?

    Where they are used in GSM Netwoeks and what is the purpose for these messages ?



Viewing 3 posts - 1 through 3 (of 3 total)
Reply To: PSI(provide subscribe information)
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