Feature Description

SMF supports the Indirect Data Forwarding Tunnel (IDFT) timer during the IDFT procedures for 5G to a 4G handover. During the handover, the IDFT tunnels of 5G are released. SMF receives the NSMF PDU Session Update SM Context Request to release the forwarding tunnels from AMF. When SMF does not receive this request, the IDFT timer ensures the release of unused tunnels.