This use case is intended to illustrate the normal case for a basic call as a reference and for completeness.
Use case 7:
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Two normal subscribers belong to two different new networks (A and D) supporting both Priority Service and eMLPP.
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The subscribers roam to two different new networks (B and C) supporting both Priority Service and eMLPP.
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The subscriber in (B) sets up a normal call towards the subscriber in (C).
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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.