Small to mid-size enterprise
Issue 6 January 2008 73
● You can configure the dialer interface to connect to the media gateway’s primary MGC via
a modem connected to the J-series router in the event that the connection between the
media gateway and the MGC is lost.
● You can configure the Avaya Communication Manager to support the auto fallback feature,
which enables a media gateway being serviced by an LSP to return to its primary MGC
automatically when the connection is restored between the media gateway and the MGC.
When the media gateway is being served by its LSP, it automatically attempts to register
with its MGC at periodic intervals. The MGC can deny registration in cases in which it is
overwhelmed with call processing, or in other configurable circumstances. By migrating
the media gateway to the MGC automatically, a fragmented network can be unified more
quickly, without the need for human intervention.
Note:
Note: Auto fallback does not include survivability. Therefore, there is a short period
during registration with the MGC during which calls are dropped and service is
not available. This problem can be minimized using the connection preserving
migration feature.
● The media gateway features a dynamic trap manager, which enables you to ensure that
the media gateway sends traps directly to the currently active MGC. If the MGC fails, the
dynamic trap manager ensures that traps are sent to the backup MGC.
Backup and restore
The IG550 allows the backup and restore of TGM50 data to an FTP server on the network.
You should backup TGM550 configuration data separately from the J-series configuration data.
You can backup J-series router data to a USB stick, the internal compact flash, or an external
compact flash.
Converged Network Analyzer (CNA) test plug
CNA test plugs are a component of CNA, a distributed system tool for real-time network
monitoring that detects and diagnoses converged network-related issues. CNA is deployed in
the media gateway to identify any network conditions or impairments that can degrade the user
experience for IP telephony and to monitor overall network performance. Test plugs in media
gateways provide the ability to measure end-to-end service to the edge of the PSTN, or at
points where codec changes are required for interworking between high (LAN) and low (WAN)
speed links.
