Ericsson 4187 Plus - Manual (Page 9)

9 Dialog 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.