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• Configure Automatic Congestion Control parameters as present in Genral option of Configuration section under Gateway heading as explained in the below link:
  NSG General Automatic Congestion Control Config

• Once above step is done goto Route Management Section of TDM configuration (NSG-GUI -> Configuration -> TDM) and then configure below paramters :

  • Average Call Rate Timer 

  • T29 Timer

  • T30 Timer
    

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and then carry on with your SS7 configuration. Once configuration is done goto Apply as present within Configuration section under Management heading and click on Generate Configuration/Generate and Start Gateway.

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For reference here is the attached sample 

References

1)  ITU-T Recommendation Q.764 Section 2.11, Signalling System No. 7 ISDN User Part signalling procedures.
2) UK ISUP Overload Controls document i.e. PNO-ISC/INFO/015 as described in BT Certification requirement document