Samsung IPX-S300B System Description page 70

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Callback
When a user calls another user but if the called party is busy or does not answer, the caller
can enable the callback feature so that when the called party becomes available, the caller's
phone will ring, and if the caller answers the phone, the called party number is redialed.

Callback Busy
The Callback Busy function is for connecting the calling and called users by
generating a call to both parties when the called user for whom the IPX-S300B is
scheduled becomes idle after the calling user has requested a callback to the called
user whose line was busy in the first instance.

Callback No Answer
The Callback No Answer function is used for connecting the calling and the called
users by generating a call to the both parties when the line status of the called user for
whom the IPX-S300B is scheduled becomes busy then returns to idle after the calling
user has requested a callback to the called user who did not answer in the first instance.
CLI Control

Temporary CID Restriction
The temporary CID restriction feature allows the user to request that his/her number is
not shown to the called party for a particular call.
When making a call, the user can dial the temporary CID restriction feature code +
called party number to request temporary CID restriction.

Distinctive Ring by CLI
The distinctive ring by CLI feature allows incoming calls to be distinguished by
ringing different rings depending on the caller numbers.
Do Not Disturb (DND)
When Do Not Disturb (DND) feature is enabled for a user, IPX-S300B rejects all incoming
calls for the user. When there is an incoming call for a user with DND, an announcement is
played to notify the caller of the DND status and the call is terminated.

DND White List
When there is an incoming call for a user with DND, this service prevents the call
from getting rejected if the call originates from one of the caller numbers specified in
advance.
The user can use the [DND White List] menu on SCM Personal Assistant to register a
list of caller numbers to exclude from the DND service.

DND Override
When there is an incoming call for a user with DND, this service allows the caller,
while listening to the DND announcement, to ignore the DND status and have his/her
call connected.
To use the DND override feature, both 'Override Level' and 'Privacy Level' must be
defined in Class of Service. DND override is allowed only when the override level is
higher than the privacy level. The override level is applied to the user overriding DND
and the privacy level is applied to the user with DND.
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