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Cisco Bug: CSCua98812 - MME-CSFB:MME doesn't Re-send CSFB Indicator After X2HO to tgt EnodeB

Last Modified

Feb 06, 2017

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

14.0(15) 14.0(33) 16.0(1)

Description (partial)

Symptom:
1. Combined EPS/IMSI Attach
2. UE sends Extended Service Request for MO CSFB Call
3. MME sends UE Context Modification request to eNB
4. eNB sends UE Context Modification Failure with Cause X2 Handover triggered
5. Target eNB sends Path switch request, MME sends Modify bearer request to SGW, completes X2 Handover by sending Path Switch Ack to target eNB.
6. MME should re-send UE Context Modification with CSFB Indicator to target eNB.
======== But MME is not Re-sending UE CONTEXT MODIFICATION with CSFB Indicator=================

Conditions:
MME running build 14.0 (50176).

Call failing to trigger CSFB during eNB x2 handover. Goes to Voice mail 
instead.
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