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9Dialog 4187 Plus
Description
11 Programmable keys (function keys)
Ten keys for storing frequently used numbers. You can store two
numbers per key (first level and second level). See sections “Dial by
a function key” on page 29 and “Set the number of programmable
keys” on page 84.
12 Microphone
Used for handsfree conversation.
13 Mute
a. Switch microphone on or off. See section “Mute” on page 44.
b. Switch off the ring signal in idle mode or when ringing. See
sections “Silent ring” on page 18 and “Mute ring signal” on
page 18.
14 Loudspeaker on/off
Switch loudspeaker on or off. See section “During Calls” on
page 43.
15 Headset key
Activate headset. See section “Headset (optional)” on page 91.
16 R-key
Used for example to make an inquiry, to transfer a call or to
establish a conference, see section “During Calls” on page 43.
Note: Sometimes it is required to change the flash time for
the R-key, see section “Flash time (R-key)” on page 85.
17 Volume control
Adjust the volume. See section “Handset, headset and
loudspeaker volume” on page 78.
18 Loudspeaker
19 Prog On/Off switch
Enable or disable the program key. See section “Enable/Disable
function key programming” on page 90.
20 Message Waiting switch
Switch Message Waiting indication on or off. Also used to reverse
the polarity in case of crossed line cables. See section “Message
Waiting indication” on page 90.