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Cisco Bug: CSCus32767 - Issue in handling Attach-CSReq when same UE's 4G to WLAN is in progress

Last Modified

Dec 26, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

16.4.0

Description (partial)

Symptom:
GW randomly rejecting initial-attach-4G-CSReq when the same UE"s 4G to WLAN is in progress.

Conditions:
GW randomly rejects initial-attach CSReq with NO-RESOURCE in below steps:

1) UE connects on IMS APN on 4G and creates dedicated bearer. Default-bearer has TFT's Precdence=48 to 53 and Ded-bearer Precedence=32-33, 36-37.
2) While Voice call is in progress, UE HO's to WLAN and ePDG sends HO CSReq , GW sends DBReq to-MME.
3) GW sends TFTs on default bearer in UBReq towards WLAN and before receiving the response, New-attach with same IMS APN for that same UE is received from MME.
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