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Cisco Bug: CSCuo70898 - MME check for syntactically invalid IMEI value

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(102)

Description (partial)

Symptom:
As designed, the MME sends the IMEISV value to EIR for validation regardless if it is syntactically correct or not.  
Customer would like the MME to check for syntactic validity prior to sending it to the EIR. 
Customer would like that MME should skip the IMEISV check and continue the call.

Conditions:
Jumping to TS 24.007 Section 11.4.2, it specifies that a syntactic error exists if one of 4 conditions exist, the relevant one being:
An IE is defined to be syntactically incorrect in a message if it contains at least one value defined as "reserved", or if its value part violates syntactic rules given in the specification of the value part.

If the IMEISV is syntactically invalid as defined by  TS 23.003 Section 6.2 as being digits only, and in the capture the first byte is a 'b' and thus does not meet this criteria, so this value, and therefore this IE is syntactically invalid.

IMEISV value in customer's pcap: b3d50522f2a0d505 (IMEISV)
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