Question: In the context of 5GS to EPS Idle mode mobility using N26 interface with I-SMF removal, which entities are replaced in the procedure defined for home routed-roaming case?
Option 1: V-SMF is replaced by H-SMF and V-UPF is replaced by H-UPF.
Option 2: V-SMF is replaced by I-SMF, H-SMF is replaced by SMF and V-UPF is replaced by I-UPF.
Option 3: V-CN Tunnel Info is replaced by H-CN Tunnel Info and H-CN Tunnel Info is replaced by Tunnel Info at UPF (PSA).
Option 4: I-SMF is replaced by H-SMF, SMF is replaced by V-SMF and I-UPF is replaced by V-UPF.
Explanation: In the context of 5GS to EPS Idle mode mobility using N26 interface with I-SMF removal, the entities that are replaced in the procedure defined for home routed-roaming case are indeed V-SMF being replaced by I-SMF, H-SMF being replaced by SMF and V-UPF being replaced by I-UPF. This replacement is necessary to accommodate the changes required for Idle mode mobility using N26 interface with I-SMF removal.