0x2916 SIP A Leg Transport Type

Reports to the host the default transport type of the A leg portion of the call.

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.

Byte	Description
0, 1	Tag 0x2916
2, 3	Length 0x0001
:	Value 1 UDP 2 TCP