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18th January 2010 at 10:30 #60762MuhammadGuest
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 congestion18th January 2010 at 11:17 #60763C300GGuest
Whats “Refusal cause” field value in CREFs?18th January 2010 at 11:28 #60764MuhammadGuest
Refusal Cause:SCCP user originated
and its 03
is this information sufficient?18th January 2010 at 11:57 #60765C300GGuest
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?18th January 2010 at 11:59 #60766MuhammadGuest
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 both7th April 2012 at 13:39 #60767sreeniGuest
We are observing lot of SCCP Connection refusals from MSC end for one of the BSC where there is no congestion in A interface.8th April 2012 at 07:05 #60768pixGuest
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).