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Cisco Bug: CSCvs56074 - Unexpected LTE Attach/TAU: Old UE Context still released with "NAS Unspecified"

Last Modified

Oct 02, 2020

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.12.15 21.17.6 21.18.0 21.6.b23

Description (partial)

MME sends NAS cause "Unspecified" for Attach Request received over Initial-UE message if the UE is in the connected state.

Issue would be observed when no key is received for NAS KSI.
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