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Question 1:

The quality of digital signals depends on the following factors. ( ) (Select 3 answers)

A. Bandwidth

B. Sampling rate

C. Bit depth

D. Number of audio channels

Correct Answer: BCD

Question 2:

For Basic request messages, ( ) is used for querying the SIP server capabilities.





Correct Answer: D

Question 3:

Audio Enhancement Technologie-ANR is used to adjust the voice volume of a telephone call. ( )



Correct Answer: B

Question 4:

Originally, MCU cascading involves one cascaded channel, which can transmit one channel of video stream. In a telepresence conference, the channel can transmit only the video for the pane in the center.After multi-channel cascading is supported, each level of MCU can transmit multiple channels of video streams and therefore can transmit all three panes in a telepresence conference, to improve user experience.( )



Correct Answer: A

Question 5:

Functions of RTP in voice over IP are as follows: Real-time transmission of media data; Jitter cancellation, Packet ordering, Packet loss prevention, Transmission of DTMP signal, signal tones, and signaling in some situations. ( )



Correct Answer: A

Question 6:

After you define the open logical channel on a private network terminal inside a firewall, if ( ), the media streams can be transmitted in one direction only.

A. The firewall does not have the relevant port enabled.

B. The private IP address cannot be found for media stream transmission.

C. The master and slave relationship cannot be determined.

D. Capability negotiation cannot be implemented.

Correct Answer: A

Question 7:

The sharp and smooth policy is applicable to single-point conferences and multiple local points conferences, except multiple remote points conferences. ( )



Correct Answer: B

Question 8:

Which of the following statements is not true about videoconferencing service in H.460.( )

A. A TCP channel is established by a private network terminal.

B. Call signaling between public and private network terminals complies with H.323.

C. After a call is established, keep-alive packets must be periodically transmitted to the maintain pinhole path.

D. After the TCP channel is established, the private network terminal is directly connected to the public network terminal by sending “connect” message to each other.

Correct Answer: D

Question 9:

Which of the following statements are true about the client proxy in H.460? ( ) (Select 3 answers)

A. The client proxy is compliant with H.460.

B. The client proxy is compliant with H.323.

C. The client proxy includes the client GK, H.460.18 client, and H.460.19 client.

D. The client proxy use H.323 to communicate with terminals.

Correct Answer: ACD

Question 10:

Current video communication mainly uses the 4:2:0 sampling. ( )



Correct Answer: A

Question 11:

SEC is Super error concealment using the ARQ algorithm. ( )



Correct Answer: B

Question 12:

From the MCU web interface, management for the user, address book, conference, and device is provided.( )



Correct Answer: A

Question 13:

Which of the following statements is true about the traversal solution using H.460? ( )

A. Public network terminals use H.460 for communication.

B. Private network terminals use H.460 for communication.

C. Both public and private network terminals use H.460 for communication.

D. Both public and private network terminals use standard H.323 for communication.

Correct Answer: D

Question 14:

In H.460, ( ) defines the traversal of H.323 signaling between public and private networks.

A. H .460.18

B. H .460.19

C. H.460.20

D. H .460.21

Correct Answer: A

Question 15:

Terminal faults include: Local video/audio faults, Remote video/audio faults, Faults related to calls or conference control.



Correct Answer: A

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