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Cisco Bug: CSCur26984 - MME-SGSN:GTP_OPTIONAL_IE_INCORRECT during GTP_FORWARD_RELOCATION

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0.0.57028

Description (partial)

Symptom:
-DUring CSFB procedure MME sends GTP_FORWARD_RELOCATION_REQ_MSG to SGSN.
-SGSN replies GTP_FORWARD_RELOCATION_RES_MSG with error cause GTP_OPTIONAL_IE_INCORRECT
-SGSN Debug traces shows that SGSN cannot decode Extended RANAP cause

Conditions:
-UE is attached in 4G and running default bearer
-UE has also 3G coverage
-UE issues a MO CS calls
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