0x299B SIP Header Field ID

This TLV contains the ID of the Header Field being reported.

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x299B
2,3 | Length 0x0002
4,5 | Value[0] Valid value: 0x0022 - Via

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.
Network Protocol Data Intelligence. Also called “Interworking,” it is a software product that operates within Excel’s Call Control (Layer 4) and Services (Layer 5) call processing layers. NPDI is meant to enhance Excel’s call processing product offering by allowing call processing layers (specifically Layers 4 and 5) to perform advanced analysis, generation, and conversion of Network Signaling (NS) Layer 3 information.
See Information Control Block.