AASTRA 4422 IP Office (SIP) for MX-ONE User Guide - Manual (Page 43)

43 Dialog 4422 IP Office
During Calls
During Calls
Handsfree
Press.
Handsfree conversation.
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:
Press.
Conversation via the handset.
Mute
É
Press to switch the microphone on or off.
When the lamp is on, the person on the line cannot hear what is
being said near to your phone.