AASTRA 4422 IP Office for MD Evolution User Guide - Manual (Page 134)

Your Extension’s Accessories
MD Evolution – Dialog 4422 IP Office 134
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Notes:
You can adjust your headset listening volume in the same
way that you would your extension’s loudspeaker or handset
volume. See the “ Operations during a Call ” section. Â
or
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When you are using the headset, you may also switch to
either loudspeaker or handset mode. To do so, simply press
the Loudspeaker key on your extension or lift the handset. Í
To return to headset mode, you must press your extension’s
Headset key once again.