0x295D Content Type

This TLV adds the content type to a SIP message. It also reports the content type, if present, in a SIP message. Prior to this feature, this TLV adds/reports content type only for the SIP INFO message. If there is a valid message body but the host has not supplied the content type, then the SIP stack adds the following content type as the default: "Content-Type: application/custom"

PPL Event Request message
PPL Event Indication message

Byte | Description
0, 1 | Tag 0x002D
2, 3 | Length Variable (Maximum of 100)
4-n | Value Null terminated ASCII string

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.
See Programmable Protocol Language.
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