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.

Outgoing call setup during real-time call processing on a specific channel.

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.

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

Real-Time Transport Protocol. Supports transport of real-time data like interactive voice and video over packet-switched networks.