Polycom 7.5 Manual De Usuario

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Chapter 6 - Operations Performed During On Going Conferences
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any conference properties while the conference is in the Secure mode. 
However, operators can terminate the conference even in this mode.
Special icons are used to indicate that a conference is in Secure mode. For a 
list of these icons see Table 5-7 on page 5-27.
Chairpersons can enable or disable the Secure mode for an On Going 
Conference, using the appropriate DTMF codes on the touch-tone telephone. 
While the conference is in a Secure mode, the chairperson and conference 
participants can perform various operations using the appropriate DTMF 
codes, such as voting or question-and-answer sessions. These operations will 
not be displayed in the MGC Manager monitoring panes. Once the 
chairperson secures or unsecures the conference, an appropriate voice 
message may be played indicating that the conference is secured.
When the chairperson secures the conference, the following operations cannot 
be performed by operators or outside participants:
Join or attend the conference
View and control the participants of the conference
View and monitor the conference properties
Implement Voting
The voice message will be played only if it is configured in the IVR Message 
Service and if the appropriate audio file has been downloaded to the Audio card.