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SCCP connection refusal

+2 votes

I see a high number of SCCP CREFs(Connection Refusal) in the logs. None of the calls are successful as observed from PM Counter statistics. The application has refused with the cause 7.From ITU-T Q.713 it indicates 00000111 network resource QoS unavailable/transient.

SCCP stack has logged unsolicited status indication with the event "Connection request failure" and cause "connection threshold exceeded".

Please let me know,

1.) What does this "connection threshold exceeded" indicate? Is this the SCCP connections ? Is it configurable ?
2.) What does "network resource" QoS unavailable/transient mean" ? Can "connection threshold exceeded" be the cause behind "network resource QoS unavailable/transient".

Please give me your valuable inputs on how to debug this further. Whether congestion can be the reason?

posted Dec 16, 2013 by Naveena Garg

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1 Answer

+1 vote

QoS unavailable/transient means that the requested QoS is unavailable and the condition is transient...
One possible cause could be max number of simultaneous connections limit has reached. Check SCCP stats for the same.

answer Dec 16, 2013 by Seema Siddique
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As per some specification and my knowledge it seems ISUP can be over SCCP or SUA protocol. My questions here are -
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I was referring the rfc4666 for M3UA and have few concerns regarding the DUPU SSNM message. The specification says that a DUPU indicates the unavailability of a certain user part.
If I may quote "The DUPU message is used by an SGP to inform concerned ASPs that a remote peer MTP3-User Part (e.g., ISUP or SCCP) at an SS7 node is unavailable"
I have two questions.
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Please correct me.

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