Nortel Networks C4012 - Manual (Page 9)

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Using the C4012 handset
Switching the handset on/off
To switch the handset on, press
o
for more than 2 seconds or place the
handset in the charger.
To switch the handset off, press
o
for more than 2 seconds when the
handset is in an idle state.
Locking/unlocking the keypad
To prevent accidental operation, press
Pa
to lock the keypad. The
display shows --------. To unlock the keypad, repeat the above procedure or
place the handset in the charger.
When the key lock is active, calls can be answered normally. To use other
handset keys during a call, unlock the handset as described above.
Switching speech monitoring on/off
During a conversation, speech monitoring activates the loudspeaker, enabling
you to hear the other party without placing the handset to your ear.
To toggle speech monitoring on or off, press
M
.
Changing the speaker and loudspeaker volume
During a call and in idle state, the speaker and loudspeaker volume can be
changed (low/high—effective for speaker and loudspeaker).
To toggle the speaker and loudspeaker volume, press
Pn
. The last
selection is remembered and valid.
Muting the microphone and ringer
To mute the microphone, press
C
.
To mute the ringer during alerting, press
C
.