Samsung DS-5012L - Manual (Page 131)

Convenience Features DS/ITP-5012L Phone User Guide
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If you are on a station call, the call should be disconnected or put on
hold before verifying the CID of a trunk line call.
10. Call Duration Display
If the Call Duration Display function is enabled, the duration of calls
through the trunk line is displayed on the LCD screen.
▪ Incoming trunk calls: The duration is displayed the moment you
answer a call.
▪ Outgoing trunk calls: The duration is displayed after a preset time or
when the recipient answers the call.
11. Door Phone Related
Features
If the door phone and your phone are connected, you can answer or call
the door phone from your station.
Answering the Door Phone
1.
When a call arrives at the door phone,
your phone rings three consecutive short
bursts.
NOTE