AASTRA 4425 IP Vision (SIP) for MX-ONE User Guide - Manual (Page 57)

During Calls
Dialog 4425 IP Vision 58
During Calls
Handsfree
Â
Press.
Handsfree conversation. í
Press to end the call.
From handsfree to handset
If the handset is on hook: u
Lift the handset.
Conversation via the handset.
If the handset is off hook: Д В
Press.
Conversation via the handset.
Mute
É
Press to switch the microphone on or off.
When the lamp is lit, the person on the line cannot hear what is
being said near to your phone.