Avaya 9335-AV - Manual (Page 13)

GB
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14 This button mutes the microphone so the other person on the
call cannot hear you. A red lamp indicates the mute is on.
Pressing it a second time releases the mute and returns you to
normal conversation. It works in Handset, Handsfree and
Headset mode.
15 This button will activate the two-way Handsfree speech circuit.
Lifting the Handset will revert to Handset working. Pressing the
button when in Handset mode will switch to Handsfree,
allowing you to replace the Handset in the cradle without
disconnecting the call in progress. When a Headset is plugged
in to the Headset socket
20 the Handsfree function is disabled
to allow the button to operate the Headset.
16 A standard telephone keypad with the number “5” having a
raised dot for visually impaired users.
26 RESET If the telephone appears not to function correctly pressing this
button will reset the telephone.