1.5 Prerequisites/Preconditions
The multitransport connection must be initiated over the main RDP connection using the Initiate Multitransport Request PDU ([MS-RDPBCGR] section 2.2.1.15.1). The underlying RDP-UDP ([MS-RDPEUDP] section 1, 2, and 3) transport which is created must be secured with Transport Layer Security (TLS) or Datagram Transport Layer Security (DTLS).<1> Furthermore, the client and server MUST support the Remote Desktop Protocol: Dynamic Channel Virtual Channel Extension (as specified in [MS-RDPEDYC]) and the client MUST advertise support for the "DRDYNVC" static channel in the Client Network Data block ([MS-RDPBCGR] section 2.2.1.3.4) sent in the MCS Connect Initial PDU with GCC Conference Create Request ([MS-RDPBCGR] section 2.2.1.3).