Hardware Watchdog Timer - Avaya Nortel Communication Server 1000 Manual

192 Features
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When only the disiTPS command is entered on a Signaling Server and the
mastership remains with that Signaling Server, then IP Phones can re-register to
both Voice Gateway Media Cards and another Signaling Server in the node.
To ensure that the IP Phones re-register only to the secondary Signaling Server,
Nortel recommends that the command disableServices be used on the
Signaling Server instead of disiTPS. Using the disiTPS command alone on the
on the Signaling Server is not recommended.
Alternatively, the vtrkShutdown command followed by the disiTPS can be
entered.
Feature operation of the Voice Gateway DISI
The Voice Gateway can also be disabled from the CLI of a Voice Gateway
Media Card. When the disiVGW command is executed, the following
happens on that card Voice Gateway:
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Care should be taken with this command to avoid a potential problem when calls
are placed on hold. When an IP Phone has a call on hold, the voice gateway
channel on the card is idle; however, it is still reserved in the Call Server. If the
voice gateway is still disabled when the call is taken off hold, the call does not
have a speech path.
Nortel recommends that the LD 32 DISI command be used for disabling the
gateway channels.

Hardware watchdog timer

A hardware watchdog timer is enabled on the Voice Gateway Media Cards.
This functionality adds further robustness to the existing exception handler
and maintenance task audits.
The hardware watchdog timer handles scenarios such as the following:
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Copyright © 2003–2008, Nortel Networks
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If the card is node Master, an election is held to transfer the mastership.
This occurs only on the Voice Gateway Media Card. The Signaling
Server node mastership is not transferred.
Idle gateway channels are unregistered.
A busy gateway channel is unregistered when it becomes idle.
the CPU failing
the code running and not triggering an exception
resetting the card and bringing it back to normal operation
Nortel Communication Server 1000
IP Line Fundamentals
NN43100-500 02.02 Standard
Release 5.5 4 February 2008
ATTENTION
ATTENTION
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