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Call flow for international Roaming

Viewing 15 posts - 16 through 30 (of 76 total)
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  • #38077 Reply
    Roameo
    Guest

    Hii,
    Find my answers

    1. Once the Subscriber info has been sent to the visited n/w, in what other scenarios (barring another LU) is the home HLR contacted by the visted MSC/VLR?
    > There are some messages (Supplementary Services) for which the VLR may initiate a contact with the HLR.
    > The other thing for which i am not very sure is USSD sessions.

    2. Is there some way of preventing the billing info to reach the home service provider and instead route it to a 3rd party.
    > Billing info is always sent through TAP. So the home operator is not invoved till the TAP records reach it. I did not really understand your question here?

    3. Does the visited HLR know, at any point of time, that a international roamer is in the network, or does the home HLR is the one point contact for any subscription info that the visited MSC/VLR may need? Incase there is any info in visited HLR, what is it & how is it updated?
    >The visited HLR is not aware of the roamers profile at any point in time.

    Cheers!
    R…

    #38078 Reply
    Scot
    Guest

    For USSD VLR will be contacting HPLMN Surely.

    Roaming always related to VLR & MSC of the Visited PLMN & HLR of HPLMN.

    VPLMN HLR never comes in to picture.

    Rgds

    #38079 Reply
    Manul
    Guest

    Thanks for clarification Roameo & Scot.

    In a scenario, where a subscriber is in the VPLMN, can the VPLMN network alot a local IMSI-MSISDN and map it to the original(HPLMN) IMSI-MSISDN so that all calls towards & from original IMSI can be treated as calls to/from local IMSI-MSISDN pair?

    This is like a multi imsi scenario just that the simcard is not a multi imsi simcard, its the original single imsi sim, just that the mapping between 2 IMSIs is maintained in the MSC(of the VPLMN) in which the subscriber is. This should be done without involving the HPLMN.

    Any thoughts?

    Regards
    Manul

    #38080 Reply
    Jacck Sparrow
    Guest

    MAP-Process Unstructured SS Request is the MAP Message used for USSD Processing.

    in HLR IMSI Related to MSISDN

    in MSC/VLR IMSI related to MSRN

    IMSI is used as Common Reference between HLR and MSC For Call routing.Obviously MSC Provides MSRN Per IMSI Based Query.
    And this is Temprory until that call.

    Mapping TWO IMSI in VLR-Not Possible.This is out of GSM STandards and I never seen such a thing.But Mapping can be possible in HLR.

    Rgds

    #38081 Reply
    Roameo
    Guest

    Manul,
    U cannot touch the IMSI part in the VLR but u can change the MSISDN part.
    The solution you r talking about is possible if and only if the VLR has 2 records (1 dummy record) for a secondary imsi which is an exact copy of the primary record with a different IMSI/MSISDN pair.
    This is a very very broad idea i can think of. If you get into specifics it becomes too complicated, since there needs to be intelligence to convert calls coming to number1 into number2, And also all map msgs would need to be transformed to update the secondary(number2) record.
    Rgds

    #38082 Reply
    Jack Sparrow
    Guest

    Hi in VLR For Terminating Calls the IMSI is used as the Rference.

    How it is possible to DO WHATEVER MANUAL Requires to do so ?

    Rgds

    #38083 Reply
    Roameo
    Guest

    Hi,
    This is what i have mentioned. You cannot touch the Imsi. But there needs to be some intelligence which modifies 2 associated records at the same time.
    This again is very very broad perspective.
    rgds

    #38084 Reply
    Manul
    Guest

    So from a high level design concept such an implementation is possible. I think this would require modifications both in VLR and MSC call implementations. But like you said, going into any further details wouldnt be useful since it would depend on specific design architectures of MSC/VLR.

    Regards
    Manul

    #38085 Reply
    S.Vijay
    Guest

    Well in that case why dont we Divert in to another issue….

    I think this group had a great discussion.

    Rgds

    #38086 Reply
    IMSI with Different MSISDNs
    Guest

    How do some operator USE their IMSI with some other country MSISDNs? Can any body comment on this matter?

    Sam

    #38087 Reply
    lody
    Guest

    hello everyone;

    How to connect TDMA hlr to GSM HLR

    #38088 Reply
    subash
    Guest

    how could you extract MGT value from IMSI?reply me soon

    #38089 Reply
    Abdel
    Guest

    Hi Subash,

    Result = E214 = CC+NDC+Remaining Digits in IMSI.Called as MGT-Mobile Global Title. This is the MGT

    #38090 Reply
    Isaac
    Guest

    Hey Guys,

    Under what conditions does a CDR in a TAP file be termed as RCF and should it be an MO or an MT?

    Please help me out.

    Rgds.

    #38091 Reply
    Pan
    Guest

    Dear, Isaac!
    What do yoy mean under RCF abbreviation? Is it Roaming-Call Forwarding??? or???

Viewing 15 posts - 16 through 30 (of 76 total)
Reply To: Call flow for international Roaming
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