AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 11)

11 BusinessPhone — Dialog 4223 Professional / Dialog 3213
Description
12 Mute
To switch the microphone on or off. See section “ During Calls ” on
page 35.
13 Loudspeaker on/off
To switch the loudspeaker on or off. See section “ During Calls ” on
page 35.
14 Clear
To disconnect calls or to clear the display in programming.
15 Microphone
16 Optional key panel (A-Q)
17 Dual-Function programmable keys per key panel. Four panels
can be connected.
Note: If one or two key panels are used, the optional key
panel DBY 409 01 may be used. However, if three or four
key panels are used, all optional key panels must be of type
DBY 409 02.
17 Loudspeaker
18 Handset with hearing aid function
Please note: The handset may attract and retain small
metal objects in the earcap region.