Polycom VIEWSTATION EX, Руководство пользователя

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Chapter 6 - Using Advanced System Features
© Polycom, Inc. 2003 205
Dial-In Calling (Optional)
The Dial-In Calling feature allows users who are already in a
videoconference to answer and add an incoming video call. Thus, an
established point-to-point call receiving and accepting an incoming
call becomes a multipoint videoconference.
Furthermore, if the incoming call is of a different type than the
already-established call or calls, the videoconference is now a mixed
protocol call. For example, the established call could be IP and the
incoming call could be ISDN. For more information about mixed
protocol calls, refer to
Mixed Protocol Dialing, on page 192 .
Downspeeding, the ability to reduce the data rate of the call
dynamically, is performed by the system when necessary. Incoming
calls (both IP and ISDN) dialed at speeds greater than the current
conference speed will be negotiated down to the current conference
speed and admitted into the conference (rate matching).
If a password has been set on the ViewStation EX system that acts as
the MCU, a Meeting Password will be required from each site
calling into the conference. For more information, refer to
Multipoint Conference Password on page 197 .
Note
This feature is optional. In order to enable this feature and all
multipoint-related capabilities, you must upgrade your system to
support multipoint calls. For more information, refer to
Upgrading
the System for Multipoint Calls .
Dial-In Calling Scenarios
With an Existing Point-to-Point Call
The following table assumes that there is already an established
point-to-point call (1 MCU and 1 site).