Polycom RealPresence 800s Administrator's Manual page 319

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Optional. Click the DNS tab.
Settings in this dialog box are relevant to Multiple Network Services only.
For more information see "NAT (Network Address Translation) Traversal" on page 16-25.
Click the Gatekeeper tab.
Modify the following fields:
Table 16-7 Default IP Service – Conferencing – Gatekeeper Parameters
Field
Gatekeeper
Primary Gatekeeper
IP Address or Name
Alternate Gatekeeper
IP Address or Name
MCU Prefix in
Gatekeeper
Register as Gateway
Description
Select Specify to enable configuration of the gatekeeper IP address.
When Off is selected, all gatekeeper options are disabled.
Enter either the gatekeeper's host name as
registered in the DNS or IP address.
Enter the DNS host name or IP address of the
gatekeeper used as a fallback gatekeeper used
when the primary gatekeeper is not functioning
properly.
Enter the number with which this Network Service registers in the
gatekeeper. This number is used by H.323 endpoints as the first part
of their dial-in string when dialing the MCU.
Select this check box if the Collaboration Server is to be seen as a
gateway, for example, when using a Cisco gatekeeper.
Chapter 16-IP Network Services
16-11