0x273E Redirection Number (Interworking Only

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.

Byte	Description
0, 1	Tag 0x273E
2, 3	Length Variable
4	Value[0] Type of Number
5	Value[1] Redirection indicator / original redirection reason
6	Value[2] Redirection counter / redirection reason