Bosch Integral TH13 Operating Instructions Manual page 84

Setting up the telephone for your own specific needs
You can change the basic setting for handsfree calling.
Setting handsfree calling (fixed setting)
+
Setting acoustics+contrast
Handset volume
Loudspeaker volume
...
End Cancel Basic setting
84
–
Press "Volume control higher" or "Volume
or
control lower" display key.
The current settings are displayed.
Select the smallest possible setting for the
loudspeaker volume. Handsfree talking
then functions at its best.
Press display key " " or " " to change the
volume.
Press the display key "End" to conclude
End
the procedure.
The new settings are hence stored as fixed
settings for all calls.
Note:
Cancel
Should you not wish to store an alteration,
press the display key "Cancel".
Basic setting
To restore a value to the basic setting
(factory set): Press the display key "Basic
setting".
The current value will be restored to the
presetting.
Setting acoustics and contrast "