All MCUs under the same service area must have the same prefix number.
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.
Illuminance is based on the luminous flux received by the vertical surface as the standard, and if oblique illumination is used, the illuminance decreases. ( )
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.
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. ( )
In MCU ride-on-the-wall mode, you can configure IP routing to send and receive data through GE1.
In H460 networking, the H.245 TCP connection of the private network terminal is established with TS.
Image format refers to the size or resolution size of the image, common image formats include, SOCIF, QCIF, CIF, ACIF, 16CIF, HD, Full HD. ( )
A single value in the header field can only appear once in the message, such as Via, Route, etc. ( )
VR can be understood as an interactive way to guide users to a destination meeting or create a meeting. ( )
Omnidirectional poetry is suitable for large conference rooms, and pointing pickup is suitable for small conference rooms.
H.323 is used to provide multimedia services in packet-switched networks. ( )
Extended request message UPDATE , which is used to modify session properties during the call setup phase. ( )
GK's active-standby inversion is coordinated by a heartbeat connection.
The SIP protocol is the session initiation protocol for establishing, controlling, and releasing sessions. ( )
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.
In video conferencing, the empty field noise is required not to be greater than ( )dB. (Fill in the blanks)
At the heart of the NAT mapping is the modification of the destination address of the datagram header. ( )
Diagnosis of peer-to-peer networks without networking traversed by public and private networks. ( )
GK can have only one prefix.
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.
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.
The chromatic aberration (YPbPr) output supports both 16:9 and 4:3.
When sending and receiving T.140 subtitles, both parties who need to join support T.140 subtitles.
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 . ( )
During a point-to-point number call, the called terminal does not send a call request to GK until it receives setup signaling.
In the Contirmed state, both the caller and the caller can end dialog through ByE. ( )
A session-independent nature is that a SIP-URL represents a resource or user that needs to be accessed, and the message body can carry anything.
Wireshaik can capture packets of multiple network interface types, with the exception of wireless LAN interfaces.
By default, the terminal reports the packet loss rate to the MCU once per ( ).
Nlog v2.0 can export file formats including ( ).
H.460 Signaling interoperability scheme ( ).
The response message "lxx" indicates . ( )
Common SIP calls the SDP negotiation process includes (). (3 answers).
Which of the following signalings is not an H.245 signaling. ( )
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 ( ).
Which of the following is not a disadvantage of forward error correction ().
The extension requests the functionality of NOTIFY. ( )
The color temperature range for warm colors is ( ).
For the SDP protocol, line 0 contains parameters related to the session owner, where the first parameter is represented. ( )
HD terminals support peer-to-peer () calling. (3 answers).
RAS performs management functions, mainly including :() (3 answers).
The following description of the H.323 call flow is correct
Under static NAT networking, the SRC address of the terminal under the private network changes to ( ).
Incorrect description about recording server (CR101/CR102 ) is ( ).
Which signaling does it mainly include?
The MCU supports ( ) web users logging in at the same time.
RTP runs on top of ( ) and each RTP message is encapsulated in a ( ) datagram.
The most fundamental difference between the human voice is ( ).
H.460 Signaling Interoperability Scheme ( ).
The gatekeeper issues an address resolution request to other gatekeepers, which signaling can implement this function. ( )
The H.460 protocol specifies that H.323 signaling parts of the public-private network traversal are handled. ()
Which of the following descriptions of SIP registrations is incorrect. ( )
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.
Avenues for improving architectural acoustics include ( ).
The working principle of peer-to-peer calls under different GKs is that when GK resolves that the called node belongs to the neighbor GK area according to the called number, GK supports requesting the neighbor GK to resolve the called number, neighbor After GK resolution is successful, the 1P address of the called node is returned to GK, and then GK returns the IP address of the called node to the calling node. Enables a call to be established between the calling node and the called node.
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
For request messages, which of the following is not required. ( )
The following description of NAT mapping is correct ( ).
The MCU wall riding mode does not require the use of private protocols and can be used with terminals of different manufacturers. ()
Which of the following actions will prevent users from dialing the MCU's IVR number from the terminal to create a meeting?
In a multipoint meeting, users can initiate an operation that deprives the demo token from any venue.
Multi-channel cascading supports auto-spin down function ().
The types of terminal faults can be summarized as: local AV faults, remote AV faults, and call and conference control problems.
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.
Which of the following endpoints does not have MiniMCU functionality?
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.
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.
Users can call a conference access number and then create a video conference based on the IVR prompts.
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
What are some of the following reasons for the GK side to hang up a call?
Which of the following networking methods does the MCU support?
What features can the gatekeeper provide?
SEC2.0 is suitable for network packet loss models that are burst-type packet losses.
PCM coding mainly includes three processes: sampling, quantization, and coding.
When the terminal enables the remote monitoring function, the user can remotely monitor the main video image or presentation image of the end in the Web interface, and can also take photos to save, but can not view the mainstream image or presentation image of the remote end.
The video self-ring is mainly used to detect whether the local video input and output are normal.
The main advantages of AAC-LD audio encoding are: low bandwidth, low latency, and high quality. ()
A single value in a header field can only appear once in a message, such as Via, Route, etc.
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.
GK can have only one prefix.
RFC2190 defines a total of three formats of load heads for the H.263 video codec format: mode A, mode B, and mode C.
Cascade channel usage rules are consumed by priority, and resources are mutually exclusive when at the same priority.
The gateway in 502.H. 323 is between a circuit-switched network and a packet-switched network. ( )
During software installation, GK can only be installed on the C or D disk of the operating system .
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
When using the MCU wall riding mode, there is no need to add other devices traversed by public and private networks. ( )
When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().