When the gNB fails to send the PDU-x-Release (pdu-rsc-rel ) information elements (IE), the AMF shows a distinct customary behavior.

This AMF behaviour is specific to:

• The UE context release procedure

• The UE context release request message and the UE context release complete message—Both messages not having the specified information elements

By default, this feature is disabled (false).

When the configuration is enabled, the AMF sends the required updates to SMF, even when the gNB doesn't send these information elements.

To configure this feature, use the following configuration:

config 
    amf-global 
        call-control-policy ccp_name  
            policy context-release force-smf-update { false | true }
             end 

NOTES:

• call-control-policy ccp_name —Specify the UE-specific name for the call control policy.

• context-release —Configure the UE context release procedure as per the console.

• force-smf-update { false | true } —Initiate the SMF update procedure, when the PDU list isn’t available in release messages, as a part of the UE Context Release procedure. The default value is disabled (false).