Connecting telephones and adjunct systems
ASAI co-resident DEFINITY LAN gateway (DLG)
The DEFINITY LAN Gateway (DLG) is an application that enables communications between
TCP/IP clients and Communication Manager call processing. In more technical terms, the DLG
application is software that both routes Internet work messages from one protocol to another
(ISDN to TCP/IP) and bridges all ASAI message traffic (by way of a TCP/IP tunnel protocol).
The DLG listens for client connections (a specific IP Address) over a well-known TCP port
(5678). The client accesses the DLG's services by connecting to TCP port 5678 at the IP
address of the DLG's 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 Computer Telephony Integration (CTI) link. The
DLG authenticates the client based on its administration and then establishes or refuses the
connection. Once a connection is established, the ASAI layer 3 messages are transparently
passed through the DLG (that is, the DLG does not process any message content). Each TCP
connection to the DLG has a one-to-one correspondence with a CTI Iink.
The DLG application is packaged either externally on a separate circuit pack (the TN801
MAPD circuit pack) or internally, where it co-resides with Communication Manager. The
externally packaged DLG is referred to as the MAPD DLG, and the internally packaged DLG is
referred to as the Co-Resident DLG. The Co-Resident DLG and the MAPD DLG accomplish
the same basic function (ASAI to Ethernet transport).
The Co-Resident DLG is application software that co-resides with Communication Manager on
the Media Server running Communication Manager. No physical installation or MAPD-specific
administration is required for the Co-Resident DLG. In terms of switch-based connectivity, the
Co-Resident DLG is supported by the following platforms:
Avaya S8300 Media Server with Avaya G700 Media Gateway
Administration of the Co-Resident DLG is carried out on the switch using the change
ip-services SAT command. When the service type DLG is specified on the IP Services
screen, the DLG administration screen displays. The Co-Resident DLG does not rely on ports.
Port allocation is not required for administering the Co-Resident DLG.
For Avaya S8300 Media Server with Avaya G700 Media Gateway, the Co-Resident DLG relies
on the S8300 Media Server for Ethernet connectivity.
406 Installation and Upgrades for Avaya G700 Media Gateway and Avaya S8300 Media Server