Polycom MGC-100 Getting Started Manual page 62

MGC-50/MGC-100 Getting Started Guide
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c. Click OK to apply your settings and return to the Settings dialog
box.
8. Click Next.
The DNS Settings dialog box opens.
This dialog box is used to define the DNS Server IP address and the local
domain name.
For H.323 conferencing, DNS is used if gatekeeper discovery using the
gatekeeper host name and NAT auto-discovery are applied. Using NAT
Traversal, the DNS is queried for the NAT server IP address used for
allocating the public (external) IP addresses to the cards for the
conferencing session.
For SIP conferencing, domain names are required and therefore it is
recommended to enter the details of the DNS server and the local domain
name. The DNS is also used if SIP Server discovery is applied. The
system decides whether to use the DHCP or the DNS server for
auto-discovery with preference to the DNS server.