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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 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 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 link.
The DLG application is packaged either externally on a separate circuit pack (the TN801 MAPD circuit pack) or internally, where it co-resides with MultiVantage Software. 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 Avaya MultiVantage Software on the Media Server running MultiVantage. 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:
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 form, the DLG administration page displays. The Co-Resident DLG does not rely on ports. Port allocation is not required for administering the Co-Resident DLG.
For Avaya S8100 Media Server configurations, the Co-Resident DLG cab use the C-LAN (TN799), the Processor Card (TN2314), or both as its Ethernet interface. For Avaya S8300 Media Server with Avaya G700 Media Gateway, the Co-Resident DLG relies on the S8300 Media Server for Ethernet connectivity.
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