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Introduction to Your Extension
MD Evolution – Dialog 4223 Professional
10
Í 10 Headset Key
Pressing this key toggles between the handset calling mode and
headset operation. There is a headset jack on the underside of your
extension.
See also the “Your Extension’s Accessories” section.
ì 11 Volume Control Keys
During a call, these two keys control the listening volume on your
loudspeaker or handset. When an incoming call is ringing, these
keys also control the ring volume for your extension.
See also the “Operations during a Call” and “Programming Your
Extension” sections.
í 12 “C” Key (Clear or Erase)
This key disconnects an incoming or outgoing call executed in
handsfree mode. It also enables you to exit your extension’s
programming mode.
See also the “Operations for Incoming Calls”, “Operations for
Outgoing Calls”, and the “Programming Your Extension” sections.
13 Location of the Microphone
14 Location of the Loudspeaker
Your extension has a microphone and a loudspeaker for the hands-
free or speakerphone calling modes.
15 Handset
This also features a speakerphone function.
16 Satellite or Add-on Key Panel
Your extension may be equipped with (a) satellite(s), each featuring
17 programmable repertory keys. From one to four additional panels
may be connected to your extension.
See also the “Your Extension’s Accessories” section.