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Cisco Bug: CSCun69379 - MME not sending Service Reject after receiving bad Servie Request

Last Modified

Feb 04, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

15.0(16)

Description (partial)

Symptom:
UE sends multiple Service Request for mobile data but MME never responds until UE gives up and try with Initial UE Attach.

Conditions:
In 3G->4G TAU, after MME sends TAU Accept (with new GUTI), UE sends another TAU Request (with newly assigned GUTI) and then sends TAU Complete. After receiving TAU Complete, MME sends TAU Reject so the MME never maps the newly assigned GUTI with the UE. Later UE sends Service Request for mobile data but MME never responds to it
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