2.2.1 MSBMSGBASE

The MSBMSGBASE header defines the packet header.

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dwSignature
wVersion																wMessageId
cbMessage
hr

dwSignature (4 bytes): An unsigned 32-bit integer that identifies the protocol as the MSBD Protocol. This value MUST be 0x2042534D, which is the little-endian representation of the ASCII character sequence "MSB[space]".

wVersion (2 bytes): An unsigned 16-bit integer that represents the version number of the MSBD Protocol. This value is currently 0x0106.

wMessageId (2 bytes): An unsigned 16-bit integer that designates the MSBD packet type. This value MUST be one of the following.

Value	Meaning
0x0001	Designates an MSB_MSG_REQ_PING packet.
0x0002	Designates an MSB_MSG_RES_PING packet.
0x0003	Designates an MSB_MSG_REQ_STREAMINFO packet.
0x0004	Designates an MSB_MSG_RES_STREAMINFO packet.
0x0005	Designates an MSB_MSG_IND_STREAMINFO packet.
0x0007	Designates an MSB_MSG_REQ_CONNECT packet.
0x0008	Designates an MSB_MSG_RES_CONNECT packet.
0x0009	Designates an MSB_MSG_IND_EOS packet.
0x000A	Designates an MSB_MSG_IND_PACKET packet.

cbMessage (4 bytes): An unsigned 32-bit integer that contains the byte length of the packet, including the header. The cbMessage field MUST be set to a value in the range 0x0010 to 0xFFFF, inclusive.

hr (4 bytes): An unsigned 32-bit integer field representing the status of an operation. The hr field MUST be set to an HRESULT code. For HRESULT codes, see [MS-ERREF] section 2.1.