Which of the following protocols is a dual-stream protocol in the H.323 protocol stack?

Which of the following protocols is used to propagate the stream between the MCU and the network recording server?

Enter the ( ) filter condition in the Wireshark Display Filter box to display only H.245 protocol-related messages.

What features can the gatekeeper provide?

RFC2190 defines a total of three formats of load heads for the H.263 video codec format: mode A, mode B, and mode C.

supports up to 1080I dual-stream, which is the industry's highest dual-stream processing capability.

Users can call a conference access number and then create a video conference based on the IVR prompts.

Currently, the MCU supports the upgrade methods ( ).

Under static NAT networking, the signaling description of the public network terminal calling the private network terminal is correctly ( ).

H.460 In networking, the communication between the terminal and the clientGK follows the protocol ( ).

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

931 Loaded on the ( ) layer.

The SIP protocol is a ( ) protocol.

In a networking network, what is the code flow hole between the public network and the private network terminal maintained? ( )

From the logs captured above, you can see the reason for the call failure. ( )

The main roles of RTCP include ( ).

Which of the following messages belongs to the extension request message. ( )

What are the ways to schedule recorded meetings. ( )

There are several ways to join an IVR meeting at a venue ( ).

MSDR is the master-slave decision to reject the message, when the result of the ability to exchange is inconsistent with the settings on this end, then reply to the MSDR

Which parts must be included in the transaction. ( )

Under the video service, for public network calls to the private network can be changed to private network calls to the public network, the public and private network traversal technology used is generally ( ).

(2 answers).

According to the H.323 protocol, a message sent by the caller to the caller indicates which message ( ) the called user has off-hooked.

A short message is when a message ( ) can be sent to a designated venue or to all venues for inter-venue communication and information prompting.

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

In the Early state, dialog can be terminated by ( ).

Which of the following features is provided by the gatekeeper ( ).

Which of the following messages is not a status query message. ( )

Common SIP calls to the SDP negotiation process include ( ).

In the Early state, the caller can terminate the dialog by sending (). (2 answers).

The private network terminal does not enable NAT, and the public network terminal calls the private network terminal inside the firewall to fail, and the root cause is ( ).

The terminal reads the camera data by ( ).

During a point-to-point number call, the terminal ends up getting a ( ) of the peer terminal from GK to make the call.

Which of the following is a mixing strategy ( ).

RTP runs on top of ( ) and each RTP message is encapsulated in a ( ) datagram.

When the endpoint/MCU calls with a number, the ARQ call information does not contain any of the following ( ).

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

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).

The H323 protocol ends up with the number 3 denoting ( ).

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

As can be seen from the figure, the venue can not receive remote venue video in the meeting, what measures can the user take to locate the cause of the failure?

When the Huawei video terminal is successfully connected to the camera, the user can set the camera parameters through the web interface of the terminal, such as exposure mode, white balance mode, noise reduction, etc., where the larger the noise reduction value setting, the less noise in the picture and the clearer the details of the image.

What are some of the following ways to create a video IVR meeting?

SEC2.0 is suitable for network packet loss models that are burst-type packet losses.

What factors does the quality of digital audio depend on?

Adhoc meetings are instant meetings, users can activate the meeting and join the meeting on the terminal side, and the operation process has video and audio prompts.

is a general multimedia communication control protocol, mainly for conference communication design, H.323 system using H.245 protocol as a control protocol, for the establishment, maintenance and release of control channels.

What is the range of empty field noise requirements in the acoustic key indicators?

Jitter Buffer calculates network latency based on the transmission and reception time of messages, statistically averages the changes in message delays, predicts network jitter based on historical statistical results to track network conditions, and uses the minimum delay to achieve the goal of eliminating jitter Target.

During a peer-to-peer number call, the terminal ends up getting the () of the peer terminal from GK and makes the call.

What are the following ways to improve building acoustics?

GK can have only one prefix.

The large amount of data and the existence of data redundancy in the sound signal are the basis for the encoding of digital audio.

What properties does the color rendering index affect on the color of a video image?

During a peer-to-peer number call, H.245 performs capability set matching before opening the logical channel. ()

When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().

The terminal recording request will be sent to the MCU, and then the MCU will uniformly record and broadcast the operation.

Call Setup Signaling SETUP refers to a message sent by the caller to the called, indicating that the call is wanted to be established.

Wireshaik can capture packets of multiple network interface types, with the exception of wireless LAN interfaces.

In the Contirmed state, both the caller and the caller can end dialog through ByE. ( )

Only if the terminal supports T.140, you can use the T.140 method to send banners, subtitles, or short messages to a specified venue.

A multi-screen conference needs to occupy the MCU one-way multi-screen encoding resources, and N sprites need N/2 multi-screen decoding resources.

The MCU's built-in WEB includes multi-user management, address management, conference management, and device management. ( ) When using the MCU wall riding mode, there is no need to add

other public and private network traversal devices. ( )

When using MCU wall riding mode, the terminal on the GE0 side can call the terminal on the GE1 side over IP.

In the SMC2.0 system, ( ) has the highest level of user rights. (Fill in the blanks)

VR can be understood as an interactive way to guide users to a destination meeting or create a meeting. ( )

H.323 gateway refers to a node that provides real-time two-way traffic between the H.323 terminal on the SCN and other nodes on the PBN.

Any SIP message consists of a starting line, a header field, and a message body, and the header domain must end with CFLF (Carriage Return Line Feed).

Multi-channel cascading, mainly through the establishment of multiple cascaded channels between the cascading conferences of the MCU, the multi-channel code stream on the MCU is sent to the peer

MCU.

The opening process of the logical channel in the H323 protocol follows the principle of "who transmits, who opens". ( )

Network recording and broadcasting does not occupy any resources of the MCU, and there is no interference with the running status of the video conference.

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

The key point of signaling packet analysis is to be familiar with the flow of signaling, and when problems are found, focus on which signaling packages should be in the signaling process, and filter irrelevant

data. The grab packet didn't catch which messages should have. ( )

Network recording can record the audio and video output of any venue in the video conference (voice, SD/HD/Zhizhen) and play it back on demand via web.

SEC: Super Error Concealment is an anti-packet loss technique using the ARQ algorithm.

During a point-to-point number call, the called terminal does not send a call request to GK until it receives setup signaling.

Omnidirectional poetry is suitable for large conference rooms, and pointing pickup is suitable for small conference rooms.

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

Color temperature affects the white balance of the camera, and where the color temperature is complex, the image can be cast.

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

Multicast, is a network technology that allows one or more senders (multicast sources) to send a single packet to the receiver (once, simultaneously).

The wall riding scheme is a simple public and private network crossing method, which connects different network ports of the MCU in different networks to realize the terminals in different networks to access

the same conference.

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

Non-T.140 subtitles only support sending and receiving subtitles from H.323 type terminals.

A transaction can only be identified by a unique branch.

The color rendering index affects the reproducibility of the image, and when the color rendering index is low, the color of the image will deviate greatly from the original image. ( )