Absence of NodeID Attribute from N4 Messages

As per the 3GPP specifications, the NodeID attribute uniquely identifies the SMF to the UPF. This IE is a mandatory attribute in the N4 Session Establishment Request or Response message. The UPF currently does not support this IE in any of the Session Management related messages. As a customization, the SMF does not send this IE and does not expect this IE in the response messages.