0x27C9 Charge Area Information Parameter

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 0x27C9
2, 3	Length Variable
4	Value[1] Number of Digits
5	Value[2] First pair of CBD digits
6	Value[3] Second pair of BCD digits
7	Value[3] Third pair of BCD digits