This use case is intended to illustrate the normal case for a basic call as a reference and for completeness.
Use case 7:
Two normal subscribers belong to two different new networks (A and D) supporting both Priority Service and eMLPP.
The subscribers roam to two different new networks (B and C) supporting both Priority Service and eMLPP.
The subscriber in (B) sets up a normal call towards the subscriber in (C).
The call is routed via an intermediate non-3GPP network.
In this use case, the call is treated as a normal call in all networks.