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Operations during a Call
MD Evolution – Dialog 4223 Professional
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Operations during a Call
When a call is established, your extension offers you the option of
alternating between the handset only and handsfree modes, and
between group listening and mute modes.
You may also control the listening volume for your extension’s
handset or loudspeaker.
You also have access to various services for processing your calls,
including:
• Enquiry call to consult another internal or external party.
• Refer back call between two on-line parties or broker’s call.
• Call transfer between two parties.
• Conference call with three or four participants.
You may also temporarily place a call on hold, in order to carry out
a non-telephone related task, or you may park a call in order to pick
it up on a different extension.
Loudspeaker Mode
When you participate in an incoming or outgoing conversation
using the handset, you can, at any time, decide to activate your
extension’s loudspeaker mode, so that a group of people may
listen in on the ongoing conversation. To do so:
 Simply press this key on your extension to activate the loud-
speaker mode, without hanging up the handset.
The associated LED will light. Only your extension’s loudspeaker
is activated, while the conversation continues on the handset (the
extension’s microphone is inactive).