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By viewing the system information of Huawei terminals, we can view specifications such as voice, image, interface, and bandwidth.
RTP is a real-time transmission control protocol: on multicast (multicast) or unicast (unicast) network services, provides end-to-end network transmission capabilities, suitable for applications to transmit real-time data, such as audio, video or simulation data.
A single value in a header field can only appear once in a message, such as Via, Route, etc.
The MCU has built-in WEB it can also manage other McUs in addition to this MCU. ( )
SDP It is not a transport protocol, it uses the appropriate protocol to get the job done, including protocols such as ( ).
In video conferencing, the empty field noise is required not to be greater than ( ).
During a point-to-point number call, the terminal ends up getting a ( ) of the peer terminal from GK to make the call.
The SIP () was adopted in June 2002 , which is the core specification for the SIP protocol .
Regarding the Client proxy in the H.460 protocol, the following description is correct ( ).
In an RTP message, Timestamp reflects the sampling moment of the first bit in the RIP packet. The instantaneous accuracy of sampling must meet the synchronization requirements for synchronization and jitter calculations. The starting value of the time flag is random and will be incremented with the size of the message data.
Which of the following ways does HD terminal support to initiate peer-to-peer calls?
08:08:01 ARJ sendto[(61.131.13.141:1719)][Caller][59512724][(61.131.13.141:
1720)][Callee][59522000051][[Oxoooo006d:err.cal1 callee_offline)] From the logs caught above, which of the following is the cause of the call failure?
In the networking, in which stage of signaling transmission occurs, such as the transmission keep-alive duration, keep-alive port, and keep-alive fields?
The H460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of (). (2 answers).
Cascade channel usage rules are consumed by priority, and resources are mutually exclusive when at the same priority.
In the RTP specification (RFC3550), a total of ( ) types of RTCP reports are defined to report current control information.
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.
Forward Error Correction FEC enables super error correction when more than 0.1% of the media stream drops within 10S are detected after the two parties have established a call. The super error
correction function will divide the call bandwidth into a part and use it to transmit redundant code streams that are anti-packet loss.
Forward error correction FEC, when both parties establish a call and detect more than 0.1% of the media stream loss within 10s, the super error correction function is enabled , super loan correction
function, will be a part of the call bandwidth, used to transmit anti-packet loss of redundant code stream. ( )
The difference between Ad Hoc conferencing and traditional video conferencing systems is that you can create and join meetings on the terminal side without an administrator.
In the camera control of the WEB interface, only the local camera can be controlled, not the remote camera. ( )
Stretch mode is stretched to a full screen proportional to the output, which captures part of the image. ( )
SEC: Super Error Concealment is an anti-packet loss technique using the ARQ algorithm.
Message is the basic unit of the SIP protocol, the basic unit of interaction between the client and server sides
In video conferencing, the empty field noise is required not to be greater than ( )dB. (Fill in the blanks)
For the SDP protocol, line c contains information about the connection established for a multimedia session, which indicates the IP address used by the real media stream . ( )
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. ( )
The configuration of the 3G network of hd terminals, the following statement is correct.
Private network HD terminals use static NAT for public and private network crossing, regarding the calls between terminals, the following statement is incorrect ().
In multi-channel cascading, the upper and lower MCU multichannels use the preference of ( ).
The standby GK completes the following procedures ( ) in response to a synchronization request.
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 ( ).
After the terminal enables the NAT setting, it can change the content of the packet message, which mode can be used for NAT networking to achieve public and private network communication
In a networking network, what is the code flow hole between the public network and the private network terminal maintained? ( )
Color temperature affects the reproducibility of the color of the video image, the higher the color temperature, the more color. ( )
The gatekeeper's address translation function refers to the conversion of farm names or numbers to IP addresses based on the data table at the time of node registration.
The secondary stream can only be displayed on one display with the mainstream, not independently.
In MCU ride-on-the-wall mode, you can configure IP routing to send and receive data through GE1.
During the MCU main control board backup reversal process, the conference and venue status on the SMC will be offline for about 10 seconds.
After the endpoint enables the NAT setting, it can change the packet content and can be used for static NAT networking mode and DNAT/NAPT networking mode.
T140 captions are sent separately to the remote venue, displayed on the remote venue monitor, and superimposed on the local video image.
Test whether the terminal color output is realistic during the color bar test.
An MCU can belong to only one service area, but a service area can have multiple MCUs.
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.
The Network Diagnostic Tool supports diagnostics in peer-to-peer networks where there is no networking traversed by public and private networks.
Which of the following in the header domain is used to represent the SIP entity through which the request passes and the route response?
NLOG supports viewing historical network data for event venues within the conference ().
What are the correct items for the following description of the performance of the RSE6500 product?
networking network, the H.245TCP connection of the private network terminal is established with TS. ()
capability negotiation is primarily used to declare the receiving and sending capabilities supported by this side. When declaring the priority capability set of this end, the other party needs to prioritize the use of the ability set.
At present, the sampling method mainly used in video communication: 4:2:0 sampling method ().
Only if the peer supports T.140, it can be implemented to send banners, subtitles or short messages to the specified venue in the T.140 mode.
Illuminance, color temperature, white balance and color rendering index, these four indicators of light, have an important impact on the actual image effect of the video conference.
When the speech codec capability is negotiated in the SIP protocol, the voice codec supported by the local device is provided, including PCMU and PCMA Based on the RTP message shown in the figure, it can be seen that the ( ) voice codec is selected.
During the meeting, the output image of the venue screen changes color and the screen is flowered, which of the following measures can be taken to solve this problem?
In the meeting room design, it is recommended to use a light-colored tablecloth to reflect astigmatism to give the participants a good amount of light on their faces (jaws).
mode, communication between public and private network devices is supported, and data does not need to go through a firewall.
During software installation, GK can only be installed on the C or D disk of the operating system .
The principle of the built-in MCU of the terminal is that the terminal with the built-in MCU is connected to each terminal separately.
What is the software format of the HD Video Terminal Upgrade Pack?
Has.. dat
B. . tkn
C. . txt
D. . tp4
When GK agrees to a terminal's registration request, which of the following response messages is sent?
For reverberation, the pickup is dominated by a direct sound, and the appropriate amount of reverberation sounds thicker, and it is recommended that the pickup direct sound be around 90%. However, the reverberation sound after 50ms will affect the language comprehensibility, and it is recommended that the sound energy reached within 50ms accounts for more than 80%.
The feed can only be displayed on the same monitor as the mainstream, not independently.
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
The frequency response capacity of nature that the human ear can perceive can reach 20Hz-20KHz, using audio standards such as G.711, G.722, G.728, and the audio width is only available 50Hz-7KHz, so use AAC-LD method to solve this problem in high-definition video communication.
Four metrics, color temperature, illuminance, and color rendering index, are used to measure the effect of conference room lighting, which has an impact on the rendering of video images of the conference.
Adhoc Conferencing is a conferencing mode that allows you to create and join a meeting on the terminal side without an administrator.
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. ()
SEC2.0 is suitable for network packet loss models that are burst-type packet losses.
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.
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. ()
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.
The () phenomenon occurs in a conference when the microphone is used at the same time as the speaker and the sound system emits sound that can be collected by the microphone.
What are the correct items in the following description of the SIP protocol?
Conversations are uniquely identified by Cal1-ID, From Tag, To Tag, and can be modified after they are created.
gateway is a node that provides real-time two-way traffic between the H.323 terminal on the SCN and other nodes on the PBN.
The ( ) function in Wireshark visualizes the conversational communication process graphically.
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.
Video compression includes intra-frame compression (I frame) and inter-frame compression (P frame), common H.26X, MPEG-2, MPEG-4 Both support in-frame/inter-frame compression.
The Clear Fluency Strategy works with the H.264H.265 protocol, and if there is no ability in the public capability, the Clear Fluency Strategy will not work. ()
The Network Diagnostic Tool supports initiating diagnostic tests from the Public Network to the Private Network Diagnostic Tool.
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.
RTP is a real-time transmission control protocol: on a network service of multicast (multicast) or unicast (unicast). Provides end-to-end network transmission capabilities for applications to transmit real-time
data such as audio, video or simulation data.
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.
SR messages in RTCP are send reports that describe sending and receiving statistics as sending gateways. ( )
T.140 Subtitles support sending and receiving subtitles from SIP, H.323 type terminals.
When the MCU is operating in wall riding mode, GE0 and GE1 must be in two different network segments, and all board GE0 (or GE1) must be in the same network segment.
Only one P frame is sent at the beginning of the build during the call, and the subsequent video images are encoded using I frames.
GK's call access control function mainly refers to whether to allow nodes to initiate calls based on user rights, network bandwidth and other conditions.
The H460 protocol specifies that the H.323 media streaming portion of the public-private network traversal processing process is
H.460.19 specifies the public-private network traversal processing of H.323 call control signaling.
TCs are capability exchange requests that inform the peer of the capability information ( ).
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. ( )
Color temperature represents the most general indicator of the spectral quality of a light source in lux (Lux , lx ). ( )
Master-slave decisions are mainly used to prevent both parties from triggering the same unsharable event or resource at the same time during communication, so a master party needs to be identified in
advance. When a conflict occurs, the slave shall act at the discretion of the master.
In the Cseq header domain, Cseq is used to uniquely identify an invitation or a registration. ( )
If both the sender and receiver () are the same, the MCU forwards directly. (3 answers).
In an RTP packet, the initial value of the Sequence number is random, no RTP packet is sent, and the sequence number is incremented. The receiver detects packet loss and rebuilds packets based on it.
Illuminance is based on the luminous flux received by the vertical surface as the standard, and if oblique illumination is used, the illuminance decreases. ( )
Desktop tones can be taken as skin color adjacent to color or gray, avoiding the same color of skin tone; Desktop reflectance should be higher than skin tone, highlighting the skin image.
Wireshark is a network packet analysis tool whose main role is to capture network packets in real time on the interface and display the detailed protocol information of the packets in detail. ( )
H.323 During the call flow, the MCU records the registered address of the terminal.
Background lighting can improve monotonous backgrounds; The background light should be dimmer than the main light to highlight the human image and create a sense of depth. ( )
If you accidentally drop the meeting in the terminal meeting, you can join the meeting by calling the special service number.
The mcu wall riding mode requires modifications to the firewall in the original network ( such as open ports ).
The role of MP is to complete the interaction of control information with the conference TV terminal.
RTCP is a real-time transport protocol that can be used as a way to detect and control data transmission, and this protocol cannot be upgraded to a large multicast (multicast) network.
The SIP protocol is the session initiation protocol for establishing, controlling, and releasing sessions. ( )
Any color at the opposite end of the diameter of the color ring is called a complementary color. ( )
The basic concept of white balance technology is that "white objects can be reduced to white regardless of any light source", which is a case for color casts that occur when shooting under a specific light
source Compensation is made by reinforcing the corresponding complementary colors. ( )
Fe and GEO, GE1 IP addresses can not be in the same network segment, otherwise it will cause network failure, at this time the front panel ALM light is always on. ( )
Each RTP datagram consists of two parts, the header and the payload, where the meaning of the first 12 bytes of the header is fixed , and the payload can be audio or video data.
According to H. 323t, the signaling required to complete the process of exchanging capabilities is. ( )
H.460 In a networking network, the SETUP connection of the private network terminal is ().
At DVI output, the 9039S and 9039A can support a primary and secondary input resolution of 1080P 60fps, in which case the secondary can reach ( ). The resolution of .
For the relationship between the camera and the background, why can't there be too complex background? ( )
The 245.H.460 protocol specifies that the public-private network traversal processing process for the H.323 media streaming portion is ( ).
H.460 In the network, the SETUP connection of the private network terminal is
The IP header in the ACF message does not contain any of the following information ( ).
By default, the terminal reports the packet loss rate to the MCU once per ( ).
Which of the following signaling signalings can the gatekeeper issue address resolution requests to other gatekeepers?
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
Regarding the auxiliary IP of high-definition terminals, the following statement is wrong ( )o
The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.
Hd terminal 3G network configuration, the following statement is correct ().
In the Early state, the caller can terminate the dialog by sending (). (2 answers).
Which of the following messages indicates that the request cannot be implemented on any SIP server . ( )
TESTED 12 Sep 2025
