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Cisco Bug: CSCut12141 - MME corrupts IMEI values in ME Identity Check message

Last Modified

Feb 04, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

16.2.1

Description (partial)

Symptom:
Customer Request:

In Previous Builds MME handles invalid IMEI values correctly, the MME rejected the Attach after receiving S13 Invalid AVP (due to corrupted IMEI value) from EIR.  
Now, In the current build, the MME ignored the S13 Response and proceed to next step which is S6A Location Update Request to HSS.  The HSS also rejected the request with Invalid AVP due to the corrupted IMEI value in the Terminal Info IE; then MME rejects the Attach Request.

BU Response :

There were many fixes between these releases where attaches should progress in the absence of EIRs or due to misconfiguration ..etc which might have changed this behavior.
So with a failure (INVALID_AVP) from EIR still allows the call to progress.

Even with addressing this, the problem will be seen still when the EIR is down;
MME still proceeds with attach even with EIR down , this is a customer requested behavior.
If you feel MME should reject with ?EIR failure response or down " we need to have an enhancement CDETS open.

This CDET is opened as per request from BU in order to decide way forward on how to handle Invalid AVP from EIR in attach phase when receiving IMEI with special characters a-f

Conditions:
On Receiving IMEI with special characters a-f
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