0x2727 Generic Digit Information
(Interworking Only)

Used in:
0x0033 NPDI Universal ICB

Byte | Description
0, 1 | Tag 0x2727
2, 3 | Length Variable
4 | Value[0] Acknowledgement Indicator 0x00 No ending acknowledgement required. 0x01 Ending acknowledgement required. 0xF0 to 0xFD User Defined 0xFF Not set or Unknown All the other values are reserved.
: | :
: | Value[1] Number of Digits
: | Value[2] Digit 12 in BCD pair
: | Value[3] Digit 34 in BCD pair

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.