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3.2.5.3.5 Sending MCS Erect Domain Request PDU

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The structure and fields of the MCS Erect Domain Request PDU are specified in section 2.2.1.5.

The tpktHeader field is initialized as specified in [T123] section 8, while the x224Data field (which contains an X.224 Class 0 Data TPDU) is initialized as specified in [X224] section 13.7.

The MCS Erect Domain Request PDU (embedded within the mcsEDrq field) is specified in [T125] section 7, parts 3 and 10. The client SHOULD initialize both the subHeight and subinterval fields of the MCS Erect Domain Request PDU to zero.

If Enhanced RDP Security (section 5.4) is in effect, the External Security Protocol (section 5.4.5) MUST be used to encrypt the entire PDU and generate a verification digest before the PDU is transmitted over the wire.