on DND on server side if users press DND when DND is off.
DND Off Code: The code is used to turn off DND on server’s side,
if configured, door phones will send a SIP message to server to turn
off DND on server side if users press DND when DND is on.
Go to Phone - Call Feature to enable the direct IP call for door
phones first.
Configure push button with IP address, press push button to make
direct ip call.
SIP calls which use SIP numbers to make or receive calls should be
supported by SIP server. Users need to register accounts and fill
SIP feature parameters before using it.
Figure 3.4.1 Direct IP call