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Cisco Bug: CSCuq26727 - UE_UNREACHABLE response from MME to MSC after receiving

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.0.0.56079

Description (partial)

Symptom:
As per step 6, step7 and step8 of the below test case, MME should page the UE in all tracking areas served by MME. But observed that after getting MT CSFB Paging from MSC, MME is responding MSC with UE_UNREACHABLE command.

Conditions:
1. Configure Ts12-1 timer with a non-default value say 30 secs. Configure mobile-reachability timer, implicit-detach timer such that Ts12-2 timer is greater than the sum of these timer values.
2. UE Combined EPS/IMSI Attach procedure
3. S1-Release.
4. Sessmgr recovery performed. Ensure the call is successfully recovered.
5. MME should set the MME-Reset context variable to TRUE and start Ts12-1 timer.
6. MSC sends SGsAP Paging (MT CSFB) without LAI information.
7. MME should page the UE in all tracking areas served by MME. MME should use the IMSI provided by MSC to page the UE.
8. When UE responds with Extended Service Request, MME should send SGsAP Service Request to MSC.On expiry of Ts12-1, MME shall unset the MME-Reset context variable.

Actual Result:
(i) In step6 when MT Paging was sent from MSC, MME responded with UE_UNREACHABLE response.
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