Polycom KIRK 4080 - Manual (Page 15)

8.2 During conversation
8.2.1 Volume regulation:
Use the two keys placed at the right side of the handset for volume control
8.2.2 Microphone mute:
Press the
3 -key (mute-key), MIC. MUTED is showed in the display
Press the 3 -key (mute-key) to enable the microphone again
8.2.3 Transferring the call to another handset:
Press R, and dial new number
Press the -key and the call is transferred to the other handset
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