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Issue 4 October 2002 117555-233-116
7
DEFINITY LAN gateway system
What is the DEFINITY LAN gateway?
In simplest terms, the DEFINITY
®
LAN gateway (DLG) is an application that
enables communications between TCP/IP clients and Avaya
MultiVantage™
Software call processing. In more technical terms, the DLG application is software
that both routes internetwork messages from one protocol to another (ISDN to
TCP/IP) and bridges all ASAI message traffic (by way of a TCP/IP tunnel
protocol).
NOTE:
The term “DLG application” is neutral. That is, it does not carry any platform
connotations. The terms “MAPD DLG” and “co-resident DLG,” which are
introduced later, are platform specific.
How the DLG application works
Here is a high level description of how the DLG application works.
■ The DLG listens for client connections (a specific IP Address) over a well-
known TCP port (5678).
■ The client accesses the DLG services by connecting to TCP port 5678 at
the IP address of the DLG Ethernet interface (or the S8300 ethernet
interface), which can be a MAPD (TN801B), a processor (TN2314), or a
C-LAN (TN799).
■ The client then exchanges TCP tunnel protocol messages with the DLG to
request a connection to a specific CTI link.