2.2.1.1 L2TP AV Pair: Microsoft Vendor-specific Correlation ID Type (0x01)
The Microsoft vendor-specific correlation ID type option is sent in Incoming-Call-Request (ICRQ) control messages so that any tracing application is able to correlate the messages pertaining to a particular tunnel context on the L2TP Access Concentrator (LAC) and L2TP Network Server (LNS).
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M (1 bit): Mandatory (M) bit. MUST be set to 0.
H (1 bit): Hidden (H) bit. MUST be set to 0.
rsvd (4 bits): Reserved bits. MUST be set to 0.
Length (10 bits): MUST be set to 22.
Vendor ID (2 bytes): MUST be set to 0x137.
Attribute Type (2 bytes): MUST be set to 0x01.
Attribute Value (16 bytes): MUST be a 16-byte GUID, as specified in [MS-DTYP] section 2.3.4.2. This SHOULD be unique for every ICRQ request on a LAC/LNS combination.