Grandstream Networks 200 Series - Manual (Page 35)

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Allow DHCP
Option 42 to
override NTP
server
DHCP Option 42 specifies a list of IP addresses for Network Time Protocol
(NTP) servers available to the client. If you choose yes, GXP2000 will use
the NTP servers resolved from DHCP, instead of the one you specified in the
"NTP Server" option above.
Distinctive
Ring Tone Customer Ring Tone 1 to 3 with associate Caller ID: when selected, if Caller
ID is configured, then the device will ONLY sound this ring tone when the
incoming call is from the Caller ID, device will use System Ring Tone for all
other calls.
When selected but no Caller ID is configured, the selected ring tone will be
used for all incoming calls.
Disable Call
Waiting Default is No.
Lock keypad
update If this parameter is set to “Yes”, the configuration updates via keypad for
Menu Item 7, 9, 12 are disabled.