Cisco 3521 Administrator's Manual page 68

Configuring Gateway Settings
In the Gatekeeper address field, make one of the following entries:
Step 6
Enter the IP address of the gatekeeper to which the gateway registers.
a.
—or—
Click Browse.
a.
The Discovered Gatekeepers dialog box appears, displaying all gatekeepers located on the same
network segment as the gateway.
Select a discovered gatekeeper.
b.
Click OK.
c.
Step 7 In the Gatekeeper port field, enter the port number of the gatekeeper. The default setting is 1719.
Select the Registration refresh every n seconds check box to set the Time To Live interval (in seconds)
Step 8
that determines how often the gateway sends a "keep alive" message to the gatekeeper t o ensure that the
gateway registration is listed with the gatekeeper and does not expire. Enter a value in seconds in the
field.
Step 9 In the Gateway registration mode field, choose the method of registration of services with the
gatekeeper:
Version 1—For gatekeepers that support H.323 version 1.
•
• Version 2—For gatekeepers that support H.323 version 2 or later.
Select the Unregister from Gatekeeper on ISDN connection failure check box to force the gateway to
Step 10
unregister from its gatekeeper when both ISDN D-channel connections are no longer active. The
gatekeeper is forced to send new IP-to-ISDN calls through a different gateway, thus ensuring high call
completion rates. The gateway re-registers to the gatekeeper when the ISDN connected is restored.
Select the Send load balancing messages (RAI) check box to enable the sending of RAI messages to
Step 11
the gatekeeper for the purpose of load balancing on the network. If you select this option, perform steps
12 and 13.
Gatekeepers can perform load balancing on the network using feedback from the gateway in the form of
Resource Available Indication (RAI) messages that inform the gatekeeper of gateway resource
availability. If the gateway is unavailable, the gatekeeper performs line hunting operations to route the
call to an alternative gateway.
For the BRI gatekeeper, when you set the gateway for RAI/RAC, it sends periodic RAI messages that
inform the gatekeeper of the current resource availability in the gateway. The gatekeeper responds with
Resource Available Confirmation (RAC) messages to acknowledge receipt of the RAI messages. In steps
12 and 13, you can configure the upper and lower threshold for triggering RAI messages according to
resource availability in the gateway.
In the Send 'busy' when load is more than field, enter the upper threshold for gateway resource
Step 12
utilization as a percentage of total resources. When resource use is greater than the threshold, the
gateway sends the gatekeeper a 'busy' RAI message, indicating to the gatekeeper that it should stop
routing calls to this gateway.
In the Send 'free' when load is more than field, enter the lower threshold for gateway resource
Step 13
utilization as a percentage of total resources. When resource use is less than the threshold, the gateway
sends the gatekeeper a 'free' RAI message, indicating to the gatekeeper that it can resume routing calls
to this gateway.
Administrator's Guide for Cisco IPVC 3521 BRI Gateway, Cisco IPVC 3526 PRI Gateway, and Cisco IPVC 3540 PRI Gateway
3-6
Chapter 3 Configuring the Cisco IPVC 3500 Series Gateway
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