Architecture
Diameter common stack, which is the Diameter endpoint, is an interface between the NFs and both client and server modes for a supported application.
The following diagram shows the architecture of the common Diameter stack.

The common Diameter stack includes the following components:
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Network Functions—Policy and Charging Rules Function (PCRF) and Online Charging System (OCS)
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Diameter Endpoint
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Diameter interfaces on SMF—Gx and Gy clients
For more information on the supported Diameter interfaces and their related features, see the Interfaces Support chapter.