Humans obtain more than 20% information through hearing. Sound perceptible to human ears is a mechanical wave with frequencies within the range ( )of Hz.
A. 50-20000
B. 30-30000
C. 20-20000
D. 20-40000
Nlog V2.0 can export the packet loss statistics of all sites of a specified conference.0
A. TRUE
B. FALSE
An SIP message body is in MIME format which supports message bodies (text or binary) of any types and composite message bodies which contains multiple single message bodies. ( )
A. TRUE
B. FALSE
According to IVR Application Scenarios,we can create a Conference by using( ). (Select 2 answers)
A. Conference access number
B. MAC address of the MCU
C. Unified access number
D. IP address of the MCU
The core of NAT mapping is the changing of the data packet header (sink IP address). ( )
A. TRUE
B. FALSE
The relationship between RTCP port and RTP port is( ).
A. RTCP port = RTP port + 2
B. RTCP port = RTP port + 1
C. RTCP port = RTP port -1
D. RTCP port = RTP port
An H.323 terminal is a node on the network and performs real-time bidirectional communication with other
H.323 terminals, the gateway, or the MCU.( )
A. TRUE
B. FALSE
By establishing multiple cascaded channels between cascaded conferences of MCUs, you can send multiple channels of streams from the local MCU to the remote MCU. ( )
A. TRUE
B. FALSE
The recording request from a video terminals sent to the MCU and the MCU controls the record ing.( )
A. TRUE
B. FALSE
A pinhole path from the public to private networks is opened by RTP redirect messages. The pinhole is maintained by ( ).
A. Media stream from the terminal
B. Non-standard IRQ message
C. Subsequent RTP or RTCP traffic
D. Nothing
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