0x2745 Transit Network Selection
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x2745
2, 3 | Length Variable
4 | Value[0] Type of network 0x00 CCITT standardized identification 0x02 National network 0x03 International network 0x04 User specified The rest of the values are reserved.
| Value[1] Network identification plan 0x00 Unknown 0x01 Carrier identification code 0x03 Data network identification code 0x06 Land mobile network identification code The rest of the values are reserved.

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.
Comité Consultatif Internationale de Telephonique et Telegraphique (now ITU)