NEC UNIVERGE SV8100 Installation Manual page 13

Once the extensions have been put into a class of service then the class of service settings have to be
applied. In class of service settings disable all of the call pickup options, enable Disconnect
Supervision and No Callback.
The operator extensions (not the virtual extensions) have to be assigned to a timer class for the
night mode on the system when calls will be delivered to the operator console.
For the assigned timer class, set all the transfer / recall timers to 0.
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