IP PHONE FOR MX-ONE™
27 6/1553-DBC 434 01 Uen C 2010-12-17
By default, the phone is set to connect calls to the loudspeaker. If you 
are using a headset, you can switch to the headset preset mode to have 
calls connected to the headset instead.
Note:  When you lift the handset, the call is always connected to the 
handset, regardless of the type of preset setting. Activation and 
deactivation of Headset Preset can only be done when the 
phone is in idle mode.
Note:  When headset preset mode is used and when automatic answer 
is used, it is possible to announce a new call by a special tone in 
the headset.
2.12 Option Unit
It is possible to install an option unit in the phone. The option unit, which 
is built into the foot console, provides the phone with a gigabit Ethernet 
interface and an extra bell and busy signal.
Answer a call Press .
Make a call Press   and dial the desired number. In 
headset preset mode, you are not required 
to press the headset key.
Switch from headset  
to handset
Lift the handset.
Switch from handset  
to headset
Press   and replace the handset.
Clear a call
Press the Clear softkey or  .
Change volume
Press   to change the volume. 
The new volume setting is stored.
Activate Headset Preset Press   and hold for at least 4 seconds. 
A short acknowledgement signal is heard.
Deactivating Headset 
Preset Mode
Press   and hold for at least 4 seconds. 
A short acknowledgement signal is heard.