GTP-U Error Indication with Diameter Interfaces

SMF supports session report with Error Indication (ERIR). SMF responds to a session report stateless and then processes the request. SMF starts disconnect procedure of 4G sessions on receiving ERIR and triggers Delete Bearer Response (DBR) to S-GW or MME if the ERIR is for default bearer. For more information about the call flow and description, see the UPF-initiated Detach Procedure section.