In the case of multiple MCUs cascading, the () feature enables the upper venue to browse the lower venue screen across levels.

Answer(s): C

() Does not belong to the three elements of video conferencing multimedia business.

Answer(s): D

() The message indicates that the request cannot be implemented on any SIP server.

Answer(s): A

For the response message "3xx", it means ?().

The server has received the request message and is processing it.
The server must take further action to complete the request.
The request was received, processed, and successfully accepted.
Indicates that the SIP server failure could not complete the processing of the correct message

Answer(s): B

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