0x2712 Congestion Level
(Interworking Only)

Used in:
NPDI Universal ICB (0x0033)

Byte | Description
0, 1 | Tag 0x2712
2, 3 | Length 0x0002
4 | Value[0] Congestion Level 0x0000 Receiver ready 0x0001 Congestion level 1 exceeded 0x0002 Congestion level 2 exceeded 0x000F Receiver not ready

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.