Panasonic KX-T7565 Manuale Utente

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Operation
User Manual
137
 From any extension while talking to the doorphone
The door will be left open for five seconds (default). This setting can be changed by System 
Programming. 
To keep the door open for another five seconds, dial 5 again using a Panasonic 
Proprietary Telephone.
If no one answers the doorphone call within 30 seconds, the call is cancelled.
PT
SLT
On-hook.
C.Tone   
C.Tone    D.Tone   
On-hook.
Dial 5.
Dial 5.
Press 
switchhook.
C.Tone   
5
5