H11-861_V2.0 HCIP-Video Conference V2.0 Question and Answers

Protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union, which two protocols are mainly composed?

The role of the RTP protocol is ().

The chromatic aberration (YPbPr) output supports both 16:9 and 4:3

Dark-toned tablecloths are recommended to increase reflective astigmatism to keep attendees' faces (jaws) shiny.

In the figure, you can click the () button to set the capture filter.

Which of the following descriptions of the SIP protocol is correct?

What are the following message interactions included in the process of a terminal calling by number using the H.323 protocol?

Video IVR, on the basis of audio IVR, adds a video interactive interface, which can more easily and intuitively guide users to join a conference or create a conference on the terminal side. ()

When querying the "System Status" on the web interface of the RSE6500, which of the following information cannot be obtained?

When the MCU cannot connect to the SMC, what can I do to locate the cause of the failure?

When 2 MCUs are cascaded, a meeting is scheduled, and the upper and lower MCU join the meeting as a virtual venue. ( )

The 598.Q.931 protocol is the protocol used for information exchange between the gateway and the gatekeeper, and is primarily responsible for signaling processing during the call.

When GK agrees to a terminal's registration request, which of the following response messages is sent?

The following description of the relationship between the RTCP port number and the RTP port number is correct ().

When an endpoint/MCU calls with a number, the ARQ call information does not include the following () of the following

At what level is the SIP protocol located?

What are some of the following reasons for the GK side to hang up a call?

In the process of processing the video signal of the video terminal, the chip is responsible for encoding and compression. (Please fill in the English abbreviations).

What factors does the quality of digital audio depend on?

protocol for remote camera control ().

RFC2190 defines a total of 3 load heads for the H.263 video codec format: mode A and mode B and mode C/A mode is the recommended and commonly used transmission mode. ()

GK can have only one prefix.

When using the MCU wall riding mode, there is no need to add other devices traversed by public and private networks. ( )

How many GKs can a region contain?

On N1og's F1ash graphical interface, we can check the network status of the terminal by checking different data types, such as checking NRJ, the interface will show the jitter of the current terminal receiving packets. Then, by checking the box, you can see the packet loss rate of the demo code stream received by the terminal. (Please fill in the English abbreviations)/

Users can call the IP address of the MCU, enter the conference lobby, and create a video IVR according to the IVR prompts Of meetings ().

The ( ) function in Wireshark visualizes the conversational communication process graphically.

A single value in the header field can only appear once in the message, such as Via, Route, etc. ( )

To use NLOG properly, the FLASH plug-in must be installed or it cannot be used.

Due to the size of the display and the limitation of MCU resources, the number of multi-screen sprites generally does not exceed 16 sprites, otherwise the image is too small and the picture will not be clear.

1080P or 720P 50/60fps is a full-frame image of 50 frames per second or 60 frames progressively, rather than an interlaced image of 50/60 fields.

In the design of the conference room, it is necessary to avoid direct illumination of the top light and metering from the top or window, which will directly cause the impact.

Message is the basic unit of the SIP protocol, the basic unit of interaction between the client and server sides

Huawei NLOG software is part of the conference scheduling and management software, and is installed and used together with the SMC conference management software. ( )

SDP is a text-based protocol for media types, encoding schemes, address negotiation, etc. ( ) during session building

Response messages are used to respond to request messages that indicate the status of success or failure of a call, and different types of response states are distinguished by status codes, which contain

three-digit integers, the first bit of the status code Used to define the response type, the other two digits are used to further explain the response in more detail. ( )

Methods of adjusting the horizontal angle include: adjusting the seat when the screen width is fixed; Adjusting the screen width can change the horizontal angle.

Session Management (SIP) and Session Description (SDP) are not independent, they complement each other so that new applications or media can be easily added.

Peer-to-peer calls between endpoints must use an MCU, but multipoint meetings can be scheduled without an MCU.

An MCU can belong to only one service area, but a service area can have multiple MCUs.

NAT is mapped in the following ways: Static NAT, Dynamic NAT, and NAPT.

Terminal control mainly refers to the call signaling of the terminal, the negotiation of logic channels and AV capabilities, and the signaling of conference control.

Packet loss retransmission ARQ, similar to TCP's retransmission mechanism, requires the peer to resend the UDP when the UDP packet loss of the video stream is detected in the network Stream, the

receiving side stores the received stream in a certain cache, and only opens the decoding after receiving the retransmitted stream.

The sound test is to test whether the terminal audio output is correct.

Dialogs can be divided into INVITE transactions and non-INVITE transactions, where the INVITE transaction in turn includes a request message and a response message.

In video conferencing, the empty field noise is required not to be greater than ( )dB. (Fill in the blanks)

Call process signaling CALL PROCEEDING is a message sent by the caller to the called, indicating that the call is being processed.

The Network Diagnostic Tool supports diagnostics in peer-to-peer networks where there is no networking traversed by public and private networks.

The terminal can send the conference content and the active image to the remote venue through the dual-stream desktop transmission function, and the desktop transmission format is directly consistent with

the resolution size of the VGA input, which can support up to 1280*1024 The resolution of the desktop is sent.

Voice enhancement technology, automatic noise suppression ANR can solve the problem of the overall low or high call volume in the line.

Remote audio loopback, from audio input, encoding, transmission through the network to the remote end and then forwarded back, the main test network connection is normal.

RTCP can ensure the transmission quality well through RR, and each participant who receives data must send a RR.

In multimedia services, RTP is used for real-time data packet transmission, and RTCP is used to detect the quality of service of an RTP session. ( )

In the camera control of the WEB interface, only the local camera can be controlled, not the remote camera. ( )

H.323 During the call flow, the MCU records the registered address of the terminal.

Network recording supports downloading recorded files to the local area in the format ( ) and supports local playback. (Fill in the blanks)

The feed can be either the active image or the contents of the computer desktop. ( )

Intelligent control system includes video system, audio system and others, which of the following does not belong to the video system. ( )

By default, the terminal reports the packet loss rate to the MCU once per ( ).

HD terminals support ( ) such 16:9 output.

The code flow hole from the public network to the private network is opened by the redirect message of the RTP, through what to maintain? ( )

HD terminals support peer-to-peer ( ) calls.

NLOG does not support saving network data as ( ).

The advantages of static NAT include. ( )

Accept the message sent by the terminal to the gatekeeper about the gateway request to deregister registration, which of the following signaling can achieve this function

H.460 In the media streaming interconnection scheme, the preservation package is created by which of the protocols listed below ( ).

In the Early state, the caller can end dialog0 by sending ( ).

In video conferencing, local noise is required not to be greater than ( ).

The following description of nat mapping is correct () (3 answers).

Which of the following messages is used for endpoint registration ( ).

The following description of HD terminals is correct ( ).

Hd terminal 3G network configuration, the following statement is correct ().

Which of the following protocols belongs to the encapsulated transport protocol ( ).

The main roles of RTCP include ( ).

The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.

HD terminals support ( ) this type of 4:3 output.

MP mainly completes those functions () later. (2 answers).

The INFORMATION that the IP header in the SETUP message does not contain Is there? ( )

H.460 Signaling interoperability scheme ( ).

H.323 The last digit 3 in the protocol represents ().

53.H.460 Networking, the RTP keep alive stream is ( ).

Nlog v2.0 can export file formats including ( ).

The compression encoding of audio signals can be divided into ( ).

If both the sender and receiver ( ) are the same, mcus is forwarded.

In the RTP specification (RFC3550), a total of ( ) types of RTCP reports are defined to report current control information.

Which of the following is not a disadvantage of forward error correction ().