NEC DTL-6DE-1 User Manual - Page 28
Function Key Activities, Feature + 0 = Side Tone On/Off. for handset
UPC - 722580004475
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1. LED Programmable Feature keys have a built-in Light Emitting Diode (LED) that lights or flashes according to the activity of that Feature key. Function Key Activities Feature + 0 = Side Tone On/Off. (for handset)* Feature + 1 = Turns microphone on or off. Feature + 2 = Adjusts handset receiver volume.* Feature + 3 = Selects ringer tone.* Feature + 4 = Adjusts transmission/receiving volume.* Feature + 5 = Activates hands-free operation.* Feature + 6 = Deactivates hands-free operation.* Feature + 7 = Turns call indicator lamp on or off for incoming call notification. (If turned off, this lamp will still light to indicate message waiting.) Feature + 8 = Selects between Normal, Dynamic Dial Pad, and Preset Dial. Note: * indicates the services which are not available for DT700 Series. 20