Draytek Vigor IPPBX 2820 Series User Manual page 48

Time budget (per day)
Max simultaneous call
number
Enable Waiting Music
After finishing all the settings here, please click OK to save the configuration.
After choosing the answer mode, you have to specify the
right extension, group, or Virtual Fax from the drop down
list next to the answer mode selection.
Check the box to enable time budget function and configure
the time value.
If run out of budget, you can not make new call for this
trunk; the existing call will be dropped.
Type a number that the system allows people to call out at
the same time.
Check the box to enable the function of waiting music.
Then choose the music file (from user prompts) to play in
turn.
Note: This setting only affects on call involving this trunk;
the Music on Hold is system wide, it also works for
extension / extension call.
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VigorIPPBX 2820 Series User's Guide