0x27CB Non-Presentation Reason (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 0x27CB
2, 3	Length Variable
4	Value[1] Non-presentation Reason This parameter is required for KDDI and the CLIP/CLIR service. 0x01 Unnoticed because of user rejection 0x02 Unnoticed because of conflicting services 0x03 Unnoticed because of public telephone call