0x0279 SIP Local Route Lookup

Use this TLV to enable and disable local registration lookup, even if the Route Control message has the "To" IP address. If this TLV is enabled, the supplied "To" IP address is ignored. If you use internal routing and you want to make a SIP-to-SIP call, Dialogic recommends enabling this TLV. You can enable and disable the local route lookup feature for an individual call by using the NPDI SIP Local Lookup TLV (0x2914). Used in:
VoIP Protocol Configure message
VoIP Protocol Query message

Byte | Description
0, 1 | Tag 0x0279
2, 3 | Length 0x0001
4 | Value[0] 0x00 Disable (Default) 0x01 Enable

Tag-Length-Value block. A standardized block that allows data to inserted in a standard way into API messages.
Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.
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.
Voice over Internet Protocol. The delivery of voice information in digital form in discrete packets rather than in the traditional circuit-committed protocols of the public-switched telephone network (PSTN).