KX-UDT111RU (serv.man3) - Panasonic PBX Service Manual (repair manual). Page 25

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Seizes the line assigned to the DN key. When a call arrives at the DN key, pressing the key answers the call.
Status Indication

• Off:  Idle
• Green on: You are on a call using the DN key.
• Flashing green rapidly: A call is being received.
• Flashing green slowly: A call is on hold.
• Red on: A shared line is in use or on private hold at another unit.
• Flashing red slowly: A shared line is on hold at another unit.

• A shared line is a line that can be used by multiple units. This is an optional feature and may not be supported on your phone

system.

• If a call is on private hold (red, steady on), the call cannot be retrieved except from the unit that put the call on hold.

If an outside call that contains Caller ID information (a caller’s name and telephone number) is received, this information will be
logged in the incoming call log and displayed on the handset.
If a call from a number matching a number entered in the phonebook is received, the name registered in the phonebook for that
number will be displayed along with the number.

If caller information is sent by the phone system and there is also information stored in the phonebook for the same number, you
can choose which information will be displayed on the handset.
Caller information sent by the phone system is displayed by default. 
If you set the handset to display the caller information stored in the phonebook, caller information sent by the phone system will only
be displayed if the number of the caller is not stored in the phonebook.