Avaya one-X 1603 - Manual (Page 20)

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You can activate the loudspeaker of your telephone in order to hear the caller without
having to use the handset.
You can also use handsfree calling. You do not need to pick up the handset. You can
also activate handsfree mode during a call and then continue the conversation with
the receiver on-hook.
Switching on monitoring/handsfree during a call
While calling with the handset lifted:
Switching to monitoring:
Press the S PEAKER function key (LED lights up). You can then hear the caller
through the built-in loudspeaker.
Switching to handsfree:
Press the S PEAKER function key once more (LED lights up). The built-in
microphone is switched on. You can replace the handset and speak handsfree.
Adjusting the loudspeaker volume:
and Press the + and – keys.
Making a call with the receiver on-hook (handsfree)
... Enter the desired number.
Press the S
PEAKER
function key (LED lights up).
When the desired party answers, you can hear them out loud and you can also talk
to them with the receiver on-hook.
Handsfree - ending the call
While you are telephoning handsfree with the receiver on-hook:
Press the S PEAKER function key (LED turns off).
Making calls without using the handset