In which case would I-SMF be used in 5G VN group communications?
When SMF redundancy is required for 5G VN group communications.
When the SMF(s) that are part of a SMF set need to collaborate.
When the UE is not located in the service area of the SMF set associated with the DNN/S-NSSAI used for a 5G VN group.
When 5G VN group communication happens in a local area.
When the same SMF is always selected for a certain 5G VN group.