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Cisco Bug: CSCus98042 - CSFB:MME Wrongly Increments Nw Initiated CSFB Voice Call Failure Stats

Last Modified

Feb 12, 2018

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(22) 16.2.1 18.0.0

Description (partial)

CSFB:MME incorrectly increments the network-initiated  CSFB voice call failure stats

Symptom:
There is a discrepancy in CSFB voice call failure stats, when using the CSFB feature.

Conditions:
It is observed on Cisco ASR5k MME running software version 17.3.0 and seen when the following sequence of events happen:

1. Attach UE 
2. One MT Call failure due to UE rejecting call
3. Moved to Idle mode
4.  Data Downlink Notification leading to paging UE does not respond Paging fails
5. Data Downlink Notification leading to paging UE does not respond Paging fails again
6. Data Downlink Notification leading to paging UE does not respond Paging fails for third time
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