Using Your Conference Phone in PSTN Mode
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Setting Unique Ring Tones for Contacts
You can set a distinctive ring tone for each contact in your Contact Directory 
so you can distinguish callers.
To set a distinctive ring tone for a contact:
1 Press  , and then select Features > Contact Directory.
2 From the Directory screen, scroll to the contact for whom you want to 
assign a distinctive ring tone, and then press the Edit soft key.
3 From the Edit Contact screen, scroll to Ring Type and choose a ring type.
4 Press the Save soft key.
Changing the Speaker Volume
You can increase or decrease the volume of the sound you hear.
To adjust the speaker volume:
>> During a call, press   to adjust the volume up or press   to adjust the 
volume down.
Changing the Ringer Volume
You can increase or decrease the ringer volume.
To adjust the ringer volume:
>> When the phone is idle or ringing, press   to adjust the ringer volume 
up or press   to adjust the ringer volume down.
Muting the Microphones
You can mute the microphones if you don’t want other parties to hear you 
during a call. When you mute the microphones, the indicator lights glow red 
to indicate that the other party (or parties) can’t hear you. You can still hear all 
other parties while Mute is enabled.
To mute or unmute the microphones:
>> During a call, press  .
To mute or unmute the microphones if you use external microphones:
>> Press   on the phone or the Mute button on the top of the external 
microphones.