0x27C3 Remote End Signaling Port (Q.931)

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.

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

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.