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Cisco Bug: CSCvt44868 - [Non-IP Data Over SCEF] MME sending DIAMETER_ERROR_UNREACHABLE_USER, MT data not delivered

Last Modified

May 19, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.13.17 21.13.19 21.19.0 21.19.n1

Description (partial)

Symptom:
MME responds with DIAMETER_ERROR_UNREACHABLE_USER (4221) and the MT data is still not delivered to the device.

Conditions:
- UE in PSM
  - MT message is buffered on SCEF due to the device being in the PSM, 
  - receiving MO traffic from the UE, MME sends the CMR-update with cmr-flag = 1 
  - then SCEF sends buffered MT-data to the device
  - However, the MME responds with DIAMETER_ERROR_UNREACHABLE_USER (4221) and the MT data is still not delivered to the device.
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