Cisco Cisco Packet Data Gateway (PDG)

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• Secondary IPA flow delete success
• Primary IPA flow delete failed
• Secondary IPA flow delete failed
• Primary IPA flow delete no match
• Secondary IPA flow delete no match
• Primary IPA invalid flowid
• Secondary IPA invalid flowid
• Primary IPA invalid NPU response
• Secondary IPA invalid NPU response
• Max per VLR associations reached
• Invalid NPU response codes
• Primary IPA flow resp code count
• Secondary IPA flow resp code count
Emergency Call Support Irrespective of UE's Advertised Algorithm Support
CSCuz40177 - Task restart due to memory access fault while aborting Attach procedure
Feature Changes
Previous Behavior: The MME rejects emergency calls if the Attach Request is received with:
• no support indicated for any security or confidentiality algorithms, or
• a mismatch in the algorithms announced by the UE and the algorithm preference configured at the MME
(with ue-validation-level command under LTE Emergency Profile configuration mode).
New Behavior:MME code has been modified to avoid rejecting emergency calls in the above scenario.
Now for such a scenario, the MME uses NULL algorithms (EEA0 and EIA0) in response to emergency call
Attach Requests even if the UE does not advertise the support of these algorithms.
Customer Impact:
VoLTE emergency calls are successful for all UEs, no matter the UE's validation level.
Enhanced IMEI-TAC-based Operator Policy Selection
CSCuz53891 - More granular IMEI-TAC based operator policy selection
Feature Changes
Previous Behavior:
Release Change Reference, StarOS Release 19    
167
MME Changes in Release 19
Emergency Call Support Irrespective of UE's Advertised Algorithm Support