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People convert the corresponding mechanical vibrations of sound into electrical signals, which are collectively referred to as audio signals.
A firewall protects a network from attacks by "untrusted" networks, but must also allow legitimate communication between the two networks. ( )
Zone management is implemented by which of the following system modules ( ).
If both the sender and receiver () are the same, the MCU forwards directly. (3 answers).
VR can be understood as an interactive way to guide users to a destination meeting or create a meeting. ( )
The three modes of operation of the proxy are: Call Stateful, Stateless, transaction Stateful.
Color temperature represents the most general indicator of the spectral quality of a light source in lux (Lux , lx ). ( )
Which of the following sockets on the MCU is the default service network port ( ).
Loudness indicates the strength of the sound, ( ) determines the size of the loudness.
On the terminal web page, you can set parameters for subtitles, which include banners, middle captions, and instant messages. Banners and middle captions can be displayed separately or at the same
time; Instant messages can be sent to peer-to-peer private chat, broadcast and sent, or sent at a designated venue.
Color rendering index refers to the object with the light source illumination and with a standard light source illumination, the degree of its color compliance of the degree of measurement, the smaller the
value indicates the higher degree of conformity. ( )
Which of the following messages indicates that the request cannot be implemented on any SIP server . ( )
The environment of the display area requires low illumination, and the reasons for the lower illumination required at the digital projection screen are ( ).
SDP It is not a transport protocol, it uses the appropriate protocol to get the job done, including protocols such as ( ).
H.460 In a networking network, the SETUP connection of the private network terminal is ().
Which of the following values does the color rendering index required for video conferencing light sources need to be greater than?
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.
Multicast is a networking technique that allows one or more senders (multicast sources) to send a single packet to multiple receivers (once, simultaneously).
Which of the following descriptions of SIP registrations is incorrect. ( )
Protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union, which two protocols are mainly composed?
At the UDP layer, H.323 protocols fall into three broad categories, where the functions of the terminal control class are not included. ( )
Small A found that the image is not clear and the overall image is dark when holding a video conference, please analyze it in combination with the optical principles of video conference construction, which of the following is the most likely cause?
If the meeting scheduled by the user is not held on time, which of the following measures can be taken to solve this problem?
Video compression includes intra-frame compression (1 frame) and inter-frame compression (P frame), common H.26X, MPEG-2, MPEG-4 Both support in-frame/inter-frame compression.
In June 2002, SIP was adopted (), which is the core specification for the SIP protocol.
The following description of the relationship between the RTCP port number and the RTP port number is correct ().
In the networking, in which stage of signaling transmission occurs, such as the transmission keep-alive duration, keep-alive port, and keep-alive fields?
As shown in the following figure, when the user presses the "+", "-" or arrow keys in the camera control interface of the terminal, he finds that the camera at this end does not respond, which of the following is not the possible cause of the problem
When the MCU cannot connect to the SMC, what can I do to locate the cause of the failure?
Users can call a conference access number and then create a video conference based on the IVR prompts.
The following description of the standalone SC ride wall networking configuration, which one is wrong?
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).
In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()
When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().
The final effect of video conferencing is only related to the conference equipment itself, and it is not much related to the integrated environment of various peripherals in the conference room.
Speech enhancement technology Jitter Buffer is the use of a human intervention signal wave, to eliminate the echo signal generated during the communication process, while retaining other normal voice
signals, in order to achieve the normal communication Use. ( )
Cascading between MiniMCU, the default caller will be the primary MCU and the MiniMC that is already the primary MCU will be called It will not be changed again during the meeting. ( )
H. 225 is used for media channel control, including call signaling (Q. 931), and RAS messages between nodes and GKs. ( )
Call Setup Signaling SETUP refers to a message sent by the caller to the called, indicating that the call is wanted to be established.
Any color at the opposite end of the diameter of the color ring is called a complementary color. ( )
Multicast, is a network technology that allows one or more senders (multicast sources) to send a single packet to the receiver (once, simultaneously).
Static NAT converts a private address into an Internet address, and it is many-to-many, and there is no guarantee that a private address will be converted to a public address.
Wireshaik can capture packets of multiple network interface types, with the exception of wireless LAN interfaces.
To use NLOG properly, the FLASH plug-in must be installed or it cannot be used.
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.
Mixing is actually mixing the loudest venues except for your own venue, not mixing all the venue sounds.
In MCU ride-on-the-wall mode, you can configure IP routing to send and receive data through GE1.
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.
Image format refers to the size or resolution size of the image, common image formats include, SOCIF, QCIF, CIF, ACIF, 16CIF, HD, Full HD. ( )
For the relationship between photography and reflected light, how to use the reflected light of indoor decoration. ( )
The private network terminal calls the public network terminal, and when the logical channel is opened, the reason for the occurrence of a single pass of media streaming is ( ).
When the endpoint/MCU calls with a number, the ARQ call information does not contain any of the following ( ).
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 230.H.460 networking, what protocol does the tunnel between the terminal and the client GK follow? ()
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 ( ).
In video conferencing, local noise is required not to be greater than ( ).
Under static NAT networking, the SRC address of the terminal under the private network changes to ().
RTP runs on top of ( ) and each RTP message is encapsulated in a ( ) datagram.
TESTED 20 Nov 2024