0x27C3 Remote End Signaling Port (Q.931)

Used in:
0x0033 NPDI Universal ICB in:
Route Control message

Byte | Description
0, 1 | Tag Remote End Signaling Port (0x27C3)
2, 3 | Length Variable
4 . . . | Value Variable If the Remote End Signaling Port is not specified, the default value is 1720.

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.
The point in the Excel platform where a DS0 connects to a network. Also known as a "socket."