1.7 Versioning and Capability Negotiation

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The Remote Desktop Protocol: Audio Input Redirection Virtual Channel Extension is capability-based. The client and the server exchange capabilities during the protocol initialization sequence (as specified in section 3.2.5.1, and section 3.3.5.1). After the capabilities have been exchanged, the client and server do not send protocol data units (PDUs) or data formats that cannot be processed by the other.