2.2.1.4.6 Server Multitransport Channel Data (TS_UD_SC_MULTITRANSPORT)
The TS_UD_CS_MULTITRANSPORT packet is used to indicate support for the RDP Multitransport Layer ([MS-RDPEMT] section 1.3) and to specify multitransport characteristics.
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header (4 bytes): A GCC user data block header, as specified in User Data Header (section 2.2.1.3.1). The User Data Header type field MUST be set to SC_MULTITRANSPORT (0x0C08).
flags (4 bytes): A 32-bit, unsigned integer that specifies protocols supported by the server-side multitransport layer.
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Value
Meaning
TRANSPORTTYPE_UDPFECR
0x01
RDP-UDP Forward Error Correction (FEC) reliable transport ([MS-RDPEUDP] sections 1 to 3).
TRANSPORTTYPE_UDPFECL
0x04
RDP-UDP FEC lossy transport ([MS-RDPEUDP] sections 1 to 3).<15>
TRANSPORTTYPE_UDP_PREFERRED
0x100
Indicates that tunneling of static virtual channel traffic over UDP is supported ([MS-RDPEDYC] section 3.1.5.4).
SOFTSYNC_TCP_TO_UDP
0x200
Indicates that switching dynamic virtual channels from the TCP to UDP transport is supported ([MS-RDPEDYC] section 3.1.5.3).
If the server advertises the SOFTSYNC_TCP_TO_UDP flag, then the server MUST support processing success responses in the Initiate Multitransport Response PDU (section 2.2.15.2).