When accessing a specified meeting via IVR, what is the default IVR Unified Access Number?
The chromatic aberration (YPbPr) output supports both 16:9 and 4:3
During software installation, GK can only be installed on the C or D disk of the operating system .
GK When the called node belongs to the neighbor GK region based on the called number, GK supports the request to the neighbor GK to resolve the called number.
The built-in veb of the MCU can also manage other MCUs in addition to this MCU
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. ()
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 main advantages of AAC-LD audio encoding are: low bandwidth, low latency, and high quality. ()
Due to the size of the display and the resource limitations of the MCU , the number of multi-screen sprites generally does not exceed 24 , otherwise the image is too small and the picture will not be clear.
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
The multi-channel cascade feature requires that the video protocol of all multi-channel venues be consistent, and the bandwidth can be different. ()
PCM coding mainly includes three processes: sampling, quantization, and coding. ()
Horizontal viewing is the angle between the audience's eyebrows and the ends of the screen in a horizontal direction.
When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().
During the meeting, in addition to recording the meeting content, the web recording service can also watch the meeting in real time through the live broadcast client.
Which of the following represents the meaning of the response message 3xx?
When 2 MCUs are cascaded, a meeting is scheduled, and the upper and lower MCU join the meeting as a virtual venue. ( )
Loudness indicates the strength of the sound, which of the following factors determines the size of the loudness?
The primary purpose of 515.H.323 is to establish peer-to-peer media sessions and multipoint media conferences. ()
Which of the following must the SIP request message contain?
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.
The MCU wall riding mode does not require the use of private protocols and can be used with terminals of different manufacturers. ()
The H460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of (). (2 answers).
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.
Which of the following in the header domain is used to represent the SIP entity through which the request passes and the route response?
Video conferencing has certain requirements for lamps, and the lamps used require strong light efficiency, uniform and soft light, and make full use of diffuse reflection.
The feed can only be displayed on the same monitor as the mainstream, not independently.
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)/
RFC2190 defines a total of three formats of load heads for the H.263 video codec format: mode A, mode B, and mode C.
Reducing reverberation time can be achieved by covering walls, ceilings, windows, and floors with soft finishing materials.
Of the six basic request messages, ( ) are used to query the server capabilities
RRJ sendto [ ( 218.5.64.98:18616 )] [5928509444] [[0x00000065:err reg wrong account or passwork]] From the above logs, you can tell that the reason for the failure of registration is ( ).
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
Common SIP calls the SDP negotiation process includes (). (3 answers).
Zone management is implemented by which of the following system modules ( ).
The SIP () was adopted in June 2002 , which is the core specification for the SIP protocol .
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
In the MCU Web page, the format of the exported address book information is ( ).
The default mode of operation for the GE1 port of the MCU is ( ).
When scheduling the meeting, the "IP port resources are insufficient", and the check MCU corresponds to be online, and the number of 1P ports is sufficient. What could be wrong? ( )
The default operating mode of the GE1 port of the MCU is ().
Dynamic dual-streaming, following the ( ) standard.
In a networking network, what is the code flow hole between the public network and the private network terminal maintained? ( )
The standby GK completes the following procedures ( ) in response to a synchronization request.
Packet capture of network data streams can be mainly achieved in the following ways. ( )
What are the main ways to map NAT? ( )
Under static NAT networking, the signaling description of the public network terminal called the private network terminal is correctly (). (3 answers).
By default, the terminal reports the packet loss rate to the MCU once per ( ).
The IP header in the ACF message does not contain any of the following information ( ).
Which of the following messages is used for endpoint registration ( ).
The gatekeeper rejects the access authentication, address resolution request, and gives the resolution result, which of the following signaling can achieve this function
When the endpoint/MCU calls with a number, the ARQ call information does not contain any of the following ( ).
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
The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.
Currently, the MCU supports the upgrade methods ( ).
The following description of nat mapping is correct () (3 answers).
Incorrect description about recording server (CR101/CR102 ) is ( ).
The following description of the advantages and disadvantages of packet loss retransmission ARQ is correct.
The environment of the display area requires low illumination, and the reasons for the lower illumination required at the digital projection screen are ( ).
In audio coding technology, which of the following is a voice quality metric. ( )
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.
The terminal reads the camera data by ( ). (Fill in the blanks)
Message is the basic unit of the SIP protocol, the basic unit of interaction between the client and server sides
At the end of the meeting, the recording server returns the recording address to the SMC, and the SMC emails the user to watch on demand.
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. ( )
Network recording supports downloading recorded files to the local area in the format ( ) and supports local playback. (Fill in the blanks)
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.
The color temperature is defined by the absolute black body, the radiation of the light source in the visible region and the radiation of the absolute black body are exactly the same, at this time the Kelvin
temperature of the black body is called the color temperature of this light source. ( )
In MCU ride-on-the-wall mode, you can configure IP routing to send and receive data through GE1.
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.
MsDA is the master-slave decision response message, which carries the Master or Slave flag, which refers to the state of the local side.
When the MCU is working in wall riding mode, GE0 is registered with switch center and GE1 can only support IP address calling.
The SIP protocol is the session initiation protocol for establishing, controlling, and releasing sessions. ( )
A single value in the header field can only appear once in the message, such as Via, Route, etc. ( )
TCs are capability exchange requests that inform the peer of the capability information ( ).
At the heart of the NAT mapping is the modification of the destination address of the datagram header. ( )
GK must support BRQ, BCF r BRJ messages, and accept all bandwidth modification requests. ( )
Any color at the opposite end of the diameter of the color ring is called a complementary color. ( )
The packet loss rate recorded by NLOG does not include packet loss from data devices on the line.
All MCUs under the same service area must have the same prefix number.
GK can only be installed on the C or D drive of the operating system.
The feed can be either the active image or the contents of the computer desktop. ( )
The video signal starts from the input terminal device, is encoded and compressed and sent to the network, and finally displays, and has undergone many image processing links in the middle, mainly
including: IP Camera, pre-processing, compression encoding, data encapsulation and transmission, decoding, image format variation , broadcast. ( )
The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.
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.
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.
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.
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. ( )
The network diagnostic tool supports remote diagnostic mode, and the network diagnostic tool remotely controls another network diagnostic tool to initiate a network diagnosis and judgment against other
network diagnostic tools.
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