0x291C NPDI SIP To Port

In a Request for Service message and PPL Event Indication, this TLV provides information parsed from the "To" header field of the incoming SIP message (for example INVITE or REGISTER). This TLV could be used in a Route Control message to specify the remote User Agent’s addressing information, which would be used to create the "To" header for the outgoing SIP message.

This TLV provides the port from the "To" address URL.

Used in:
0x0033 NPDI Universal ICB in:
Request for Service with Data message
Route Control message

Byte | Description
0, 1 | Tag 0x291C
2, 3 | Length 0x0004
4-7 | Value Variable If this TLV is not present, a default value of 5060 is used.

See Programmable Protocol Language.
Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.
Session-Initiation Protocol. A signaling protocol used for establishing sessions in an IP network. A session could be a simple, two-way telephone call, or it could be a collaborative multi-media conference session.
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.