Toshiba DKT3000 用户手册

Door phones can be used to call phones selected in system programming. When a door phone calls, 

you hear a distinctive ringing tone, one or five times (set in system programming). You can also call a 

door phone and monitor the surrounding area.
LCD telephones display the door phone name ID when calls are made to or from door phones. 
The number of possible door phones varies by Strata CTX system, with up to 24 (01~24) as the 

maximum for larger systems. Check with your CTX System Administrator to find out the names and 

locations of your system’s door phones and record them below.

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When you hear a door phone call ringing, lift the handset or press the ringing button. A door 
phone call sounds like chimes (high/low). The extension LED flashes green (in-use) and you are 
connected to the door phone.

...or to pick up door phone calls ringing someone else’s telephone, press your extension + 

#5#5

 + 

directory number of the ringing phone.