Case18: VONR Call Failure Due to Femto UE Capability Checking

Equipment: nCelll F2240

Terminal: Huawei P40，Glaxy S21

Version: V2.5.3+V503

Plmn: 99999

1. Issue Description VONR Calls fails after Fetmo cell is fully up and vonr configuration complete.

2. Troubleshooting procedure 2.1 VONR configuration and Qos configuration check

VONRlist:

FiveQI 1 and FiveQI 5

2.2 Signal media log

FiveQI 5 Bearer established:

FiveQI 9 Bearer established:

FiveQI 1 bearer established Failed due to EPS Fallback.

2.3 CU log:

PduSessionResourceModProcedure response with “UeClass::imsVoiceSupportedInUECap ims not supported!”

UE capability information:

Summary:

Femto version force to check the VONR UE capability, if UE doesn’t report ims-parameter, it will consider UE not support VONR. Need disable the checking.

3. Solution

Query the NRcellID: Config-service-Overall-CN-CN-TA. Temporary commands: odi -n cpcellapp0 fto-set-vonr-ignore-uecap <NRcellID> 1 Permanent solution: add the commands in the script: /opt/bbu/bts/scripts/sp.sh Restart the protocol to take affect.