AASTRA 4425 IP Vision (SIP) for MX-ONE User Guide - Manual (Page 104)

105 Dialog 4425 IP Vision
Accessories
From handset to headset
Í
Press.
The Headset key lamp is turned on. d
Replace the handset.
From headset to handsfree Â
Press.
The Loudspeaker key lamp is turned on.
From handsfree to headset
Í
Press.
The Headset key lamp is turned on.
Headset Preset
By default the phone is set to Loudspeaker Preset mode, so that
calls are connected to the loudspeaker when you answer or make
calls by pressing the Line/Hold key. Also when you dial the number
without lifting the handset, the call is automatically connected to
the loudspeaker.
When you use a headset for your telephone, you can change the
setting to Headset Preset mode to get calls connected to the
headset instead. In Headset Preset mode you can make headset
calls by pressing digits directly (direct dialing). You can also answer
headset calls by pressing the Line/Hold key.
Notes:
Independent the type of preset setting, when you lift the
handset the call is always connected to the handset.
Also handsfree works as usual, that is when the
Loudspeaker key is pressed, the call is temporarily
connected to the loudspeaker.
Activation and deactivation of Headset Preset can only be
done when the phone is in idle mode.