0x291F NPDI SIP Refer to Password

Use this TLV in a PPL Event Request message that is used to generate a REFER message. This TLV specifies the referred target User Agent’s addressing information which is used to create the Refer-To header for the outbound REFER request. Use this TLV to specify a password in the Refer-To header.
Used in:
0x0033 NPDI Universal ICB in:
PPL Event Request message

Byte | Description
0, 1 | Tag 0x291F
2, 3 | Length Variable
: | Value[0] A NULL-terminated ASCII string

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.
See Programmable Protocol Language.
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.
A condition that, when met, drives a state machine from one state to another. A condition that drives a Component out of its current state by invoking an associated primitive.
American Standard Code for Information Interchange