0x2753 Calling Party Sub Address
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x2753
2, 3 | Length Variable
4 | Value[1] Starts from the octet 2 of the calling party sub address of ITU RECMN*Q.931 93.

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.
International Telecommunications Union (UN)
Call signaling protocol for setup and termination of calls.