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    Shri
    joined 10 months, 1 week ago
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GSM Call Flows → Forum → question for SMS flow in roaming cases

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  • Profile picture of support support said 10 months, 2 weeks ago ago:

    Question from Mr. shashank

    if the SUB A is from India and SUB B is also from India.
    Now the case is,SUB A is in UK (Roaming)and he is sending message to SUB B and B is in INDIA(Home network).
    so the flow of sms wil go from which SMSC?is it the SMSC in UK or the SMSC in INDIA?
    Could someone explain the detail flow or any site where i can find this flow?

    and also need to know what is the use of IW MSC in SMS flow?
    cant just SMSC direct ask HLR for the SUB B info and then submit the sms to MSC B ?

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  • Profile picture of thyraell thyraell said 7 months, 3 weeks ago ago:

    wherever the subscriber located, if he send sms, the HPLMN SMSC will be used. so in this case, the SMSC in india will be used.
    the flow is :

    forward SM (UK MSC) will be sent to UK international SCCP Gateway, then go to India SCCP gateway, then to India GMSC, then go to India SMSC. after sms is sent from India SMSC, the SMSC will send “submission ACK” to GMSC then to India SCCP GW then to Uk SCCP GW then to UK MSC then to Sub A.

    for detail you can check this url : http://en.wikipedia.org/wiki/Short_message_service_technical_realisation_%28GSM%29

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