0x29D4 SIP Do Not Close Socket

Allows an out bound call via TCP to keep its socket. Normally TCP sockets are closed after a period of time after the last message in a transaction is sent. If you include this TLV in a Route Control message that causes the use of a TCP socket, the socket will not be closed until explicitly commanded to close by the host with a PPL Event Request.

Used in:
0x0033 NPDI Universal ICB in:
Route Control message

Byte | Description
0, 1 | Tag 0x29D4
2, 3 | Length 0x0001
4 | Value[0] 0x00 Close socket as if this TLV were not sent 0x01 Do not close this socket (persistent mode)

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.