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Functional model +-----------+ +-------------------->|Application| | |Functions | | +-----------+ | ^ | | | v | +----------+ | | Resource | | | Control | | | Server | | |(Diameter | | | Server) | | +----------+ | |^ | Resource control || | Protocol || | (Diameter) || v v| +-----------+ +----------+ | End | | Resource | | User |<------------->| Control | | Equipment| | Client | +-----------+ |(Diameter | | Client) | +----------+ Network Element |