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Connection Refused – SCCP

Viewing 7 posts - 1 through 7 (of 7 total)
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  • #60762 Reply
    Muhammad
    Guest

    i am observing lots of Connection refused messages after Paging response with refusal cause SCCP user originated. these are all for Terminating calls only. happening for one BSC which is already facing air and a interface congestion

    #60763 Reply
    C300G
    Guest

    Whats “Refusal cause” field value in CREFs?

    #60764 Reply
    Muhammad
    Guest

    Refusal Cause:SCCP user originated
    and its 03

    is this information sufficient?

    #60765 Reply
    C300G
    Guest

    Might be that maximum number of SCCP connections in A-interface exceeded. Or theres not enough space for SLR/DLR session identiriers from MSC side for SCCP-connection establishment.
    You wrote that it’s only in Term-call scenarion. MO-call works?
    Whats the cause of congestion: huge traffic or some configuration failure of A-interface?

    #60766 Reply
    Muhammad
    Guest

    yes strange thing is its seen only for terminating calls. BSC suffering from it is carrying huge traffic thats y congested at air and a interface both

    #60767 Reply
    sreeni
    Guest

    We are observing lot of SCCP Connection refusals from MSC end for one of the BSC where there is no congestion in A interface.

    #60768 Reply
    pix
    Guest

    hello,

    just a thought : there could be “A signalling” congestion, rather than “A user plane” congestion ?

    which mode of tranport are you using on this interface ? TDM or IP ?

    Another idea : if the SCCP reject rate is very high, I would suggest a configuration issue. Congestion rate could lead to 5% to 10% sccp reject rate, max (assuming your interface dimensioning was done correctly).

    regards
    pix

Viewing 7 posts - 1 through 7 (of 7 total)
Reply To: Connection Refused – SCCP
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