Send USSD Notification Feature Node does not Correctly End the Dialog after Sending the Notification (Doc ID 1487756.1)

Last updated on FEBRUARY 10, 2022

Applies to:

Symptoms

Whenever the Send USSD Notification (USSN fast key) feature node is used to send a notification to the HLR (Home Location Register), one of the following error messages is generated in the syslog (/var/adm/messages) on the SLC (Service Logic Controller):

TID = TCAP transaction ID (decimal)

Further diagnosis of the traffic, captured in a trace, will reveal that the HLR is sending an abort after some timeout period:

  SLC                                HLR
   |                                  | 
   |-----TCAP_BEGIN(USSD Notify)----->|
   |                                  |
   |<-TCAP_CONTINUE(returnResultLast)-|
   |                                  |
   ~                              [timeout]
   |                                  |
   |<-----------TCAP_ABORT------------|

Or that the SLC is sending the abort fairly quickly after the response from the HLR:
 

  SLC                                HLR
   |                                  | 
   |-----TCAP_BEGIN(USSD Notify)----->|
   |                                  |
   |<-TCAP_CONTINUE(returnResultLast)-|
   |                                  |
   |------------TCAP_ABORT----------->|

Changes

Adding the USSN feature node to control plans, or upgrading software to Network Charging and Control (NCC) 4.3.0 or higher.

Cause

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