Polycom 1725-31402-001 ユーザーズマニュアル

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User Guide for the Polycom CX700 IP Phone
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During a call if you are using the handset, pressing the Volume key adjusts the 
handset volume.
During a call, if you are using the headset, pressing the Volume key adjusts 
the headset volume.
If you press the Volume key when not in call, the ringer volume is adjusted.
You can also adjust volume by selecting the Settings soft key and the Volume 
screen. Refer to 
Placing Calls on Hold
During a call, press the Hold soft key. This will be indicated on the graphic 
display by the hold on the graphic display. 
Press the Resume soft key again to resume the call.
Hosting Conference Calls
You can initiate a conference call by selecting one or more contacts, by 
selecting a contact group, or by selecting a distribution group. You start a 
conference call as an initial phone call and then add more contacts. You can 
join two calls into one conference through the Merge Calls selection.
Note
As using the Hold feature typically generates music or a beeping tone, avoid putting 
a conference call on hold.