Cisco UC500 series Configuration Manual page 16

4.3.7 "DHCP Server" may be selected so that appropriate DNS settings are applied for
PCs based on the SP requirement or if the VAR / customer intend to change the default
DHCP configuration. Cisco recommends that VARs leave this alone unless there is a
compelling need for this.
Figure 4.3.7 Changing DNS in the "data" DHCP pool settings
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