Справочник Пользователя для Polycom 7.5

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In the Browser pane, the Monitor pane or the Status pane of the main 
window, right-click the participant's icon, and then click Cancel 
Exclusive Speaker.

Alternatively, the chairperson can cancel the Exclusive Speaker mode by 
entering the DTMF code assigned to this function. The default code is 
<#5>.

During On Going Conferences, operators can designate a participant to 
function as the conference chairperson. The chairperson can perform various 
operations during the conference, such as lock or unlock the conference to 
undefined dial-in participants, initiate a voting session, become the 
conference exclusive speaker while muting all other participants and more. 

Participant can designate themselves as chairperson using a DTMF code (the 
default code is <*78>). In this case, the system requests the participant to 
enter the Chairperson password in order to become the chairperson. If the 
participant entered an incorrect password, an audio prompt is played, 
indicating that the wrong password was entered and that the participant 
should re-enter the conference chairperson password.

This option is enabled in conferences in which the assigned IVR Service has 
the following definitions: 

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The Conference Chairperson option is enabled.

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A DTMF code is assigned to the Change Chairperson function.