AASTRA 4223 Professional for BusinessPhone User Guide - Manual (Page 8)

Description
BusinessPhone — Dialog 4223 Professional / Dialog 3213 8
12 Headset
See section “
Headset - Dialog 4223 Professional ” on page 114.
13 Volume control
To adjust the volume. Also space/backspace in writing mode.
14 Clear
To disconnect calls or to clear the display in programming.
15 Microphone
16 Optional key panel
17 Dual-Function programmable keys per key panel. Four panels
can be connected.
Note: Use only optional key panels of type DBY 419 01.
17 Loudspeaker
18 Handset with hearing aid function
Please note: The handset may attract and retain small
metal objects in the earcap region.