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Charging starts before the call answered

Viewing 3 posts - 1 through 3 (of 3 total)
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  • #57242 Reply
    Asim
    Guest

    Dear All,

    Hope you are doing well!!

    I faced some problem that when call to some of African countries is made ANM message is received and call charging starts before the B party answers the call. The ACM and ANM are being received at same time during the call confirmation and ring back. From call traces it has been observed that Non-ISDN switch has somewhere been involved in between. However theoritically ISUP also supports non-ISDN calls. Please confirm why it happens and what is the mechanism behind this scenario.

    #57243 Reply
    Wallis Dudhnath
    Guest

    Sorry for the delayed response.
    Just seen this this thread.

    For ISUP you generally have the following messages exchanged before
    you can use a CIC for TX. IAM, SAM, ACM, CPG, ANM, etc..
    IAM has the digits, BCIE, HLC, LLC, etc.. ACM confirms that the information has
    been received and the node is ready to process the request.
    ANM (ANS) is the message that initiates charging and is the “trigger”
    for the switch to start the process to generate a Call Record based on
    the call duration.

    TMR will be used to see if Speech, 3.1KHz audio, 64K unrestricted (or N*64), etc.. is
    required.

    For your case you have a node that has mapped ss7/ISUP. to analog and it has been mapped back
    to ss7/ISUP. Careful attention must be made with the mapping of ISUP to your legacy analog signalling
    system.

    Let me know if you need any more support.

    VBR/ Wallis Dudhnath

    #57244 Reply
    Wallis Dudhnath
    Guest

    Sorry for the delayed response.
    Just seen this this thread.

    For ISUP you generally have the following messages exchanged before you can use a CIC for TX. IAM, SAM, ACM, CPG, ANM, etc..
    IAM has the digits, BCIE, HLC, LLC, etc.. ACM confirms that the information has been received and the node is ready to process the request. ANM (ANS) is the message that initiates charging and is the “trigger”
    for the switch to start the process to generate a Call Record based on the call duration, time of day, etc..

    TMR will be used to see if Speech, 3.1KHz audio, 64K unrestricted (or N*64), etc.. is
    required.

    For your case you have a node that has mapped ss7/ISUP to analog and it has been mapped back
    to ss7/ISUP. Careful attention must be made with the mapping of ISUP to your legacy analog signalling system.

    Let me know if you need any more support.

Viewing 3 posts - 1 through 3 (of 3 total)
Reply To: Charging starts before the call answered
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