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Configuring H.323 gatekeeper settings
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 83 of 135
Send
resource
availability
indications
Select this option if you want the
ISDN Gateway to inform the
gatekeeper about its availability or
non-availability. This information
will be used by the gatekeeper
when it is selecting where to place
calls.
There are two scenarios where
you can use this feature:
where multiple ISDN
Gateways are registered
with the same dial plan
prefix on the same
gatekeeper. When
resource availability
indications (RAI) are
configured, the ISDN
Gateway will inform the
gatekeeper when it is
unavailable; gatekeepers
that support this
functionality (the Cisco
gatekeeper for example)
will favor ISDN Gateways
in the available state when
choosing where to place
new calls
where there is only one
ISDN Gateway, and you
want to limit the use of the
gateway by IP calls. In this
way, you can ensure that
there will always be some
capacity for calls from the
ISDN network
When selected, the ISDN
Gateway will inform the
gatekeeper when it is unavailable
(that is, all its ports are already in
use).
The ability of the ISDN Gateway to send
resource availability messages is useful in a
network where there are multiple ISDN
Gateways or where there are several ISDN
Gateway blades in an MSE.
In an environment with multiple ISDN
Gateways registered with the same
gatekeeper, that gatekeeper should favor
devices in the available state when choosing
where to place new calls.
For example, when one ISDN Gateway sends
the gatekeeper a message indicating that it is
not available, the gatekeeper will then attempt
to use a different ISDN Gateway for new calls.
Enter the Threshold above which messages
will be sent to the gatekeeper. The threshold
is the percentage of available B-channels in
use; where an "available" port is a port which
has at least layer 1 up and the channel is not
in use as a D-channel/reserved channel. For
example, if you set the threshold to 80%, the
ISDN Gateway will send a message to the
gatekeeper to say that is busy when 80% of its
available B-channels are in use.
Deregister
from
gatekeeper if
no ISDN link
Selecting this checkbox ensures
that the gatekeeper will not
forward any call to the ISDN
Gateway if the gateway is not in a
state to receive calls.
This can be used to allow
redundancy: if an ISDN switch is
down, the ISDN Gateway will
deregister and the gatekeeper
may use an alternative ISDN
Gateway.
Note that all the PRIs have to be down for
deregistration. Deregistration will not occur
when the ISDN Gateway is fully loaded with
active calls.