159MD Evolution – Dialog 4425 IP Vision
Physical Programming of Your Extension
Adjusting Your Extension’s Loudspeaker 
and Handset’s Listening Volume
Your extension features a loudspeaker that has 10 different volume 
levels in order to adapt to the various conditions that arise when 
communicating in handsfree mode. This listening volume level is 
also applied to the handset.
For the hearing-impaired persons, your extension also offers an 
adjustment enabling you to increase the listening volume on the 
loudspeaker and the handset by + 6 dB in relation to a normal 
threshold.
To select a normal or loud listening volume for your extension’s 
loudspeaker and handset, after accessing your extension’s physical 
programming mode and selecting the “Hearing Level” feature then 
framed:
Select Press the dynamic function key shown on the left.
Your extension displays the following screen, with the listening 
volume selections as “Standard” or “Increased”.
Þ or Û Press one of the dynamic function keys shown on the left to 
select the desired level.
Select Press the dynamic function key shown on the left.
Your setting is saved, then after several seconds, the welcome 
screens for the physical programming of your extension are re-
displayed.
CallList  PhoneBook WAP Services
Display Contrast
Log Off Restriction
Option Unit
Network
Exit ÛÞ Select
CallList  PhoneBook WAP Services
Hearing Level
| Increased
Cancel ÛÞ Select