0x271B Cause Indicators
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x271B
2, 3 | Length Variable
4 | Value[0] Coding Standard
5 | Value[1] Location
6 | Value[2] Cause Value
7,8 | Value[3] Length of Diagnostics
9 | Value[4] Diagnostics Data 1
10 | Value[5] Diagnostics Data 2
11 | Value[6] Diagnostics Data [...]

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.