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In audio coding technology, which of the following is a voice quality metric. ( )
Regarding the auxiliary IP of high-definition terminals, the following statement is wrong ( )o
When an endpoint/MCU calls with a number, the ARQ call information does not include the following () of the following
If the meeting scheduled by the user is not held on time, which of the following measures can be taken to solve this problem?
In a networking network, the H.245 TCP connection of the private network terminal is established with TS.
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.
The video signal starts from the input terminal equipment, is sent to the network after encoding and compression, and finally displays, and has gone through many image processing links in the middle, mainly including: IP camera signal acquisition, pre-processing, compression encoding, data packaging and transmission, decoding, image format changes, playback.
What are the correct items in the following description of the SIP protocol?
From the logs caught above, it can be seen that which of the following is the cause of the call failure?
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
SDP It is not a transport protocol, it uses the appropriate protocol to get the job done, including protocols such as ( ).
RTP runs on top of ( ) and each RTP message is encapsulated in a ( ) datagram.
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 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
What is the range of empty field noise requirements in the acoustic key indicators?
The main advantages of AAC-LD audio encoding are: low bandwidth, low latency, and high quality. ()
By viewing the system information of Huawei terminals, we can view specifications such as voice, image, interface, and bandwidth.
The frame does not have complete picture data, only data that differs from the previous frame.
As shown in the figure, the RTCP instance flow includes SR, RR, and ( ) messages.
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.
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.
Which of the following describes a policy that is not part of MCU audio mixing?
During a peer-to-peer number call, H.245 performs capability set matching before opening the logical channel. ()
Conversations are uniquely identified by Cal1-ID, From Tag, To Tag, and can be modified after they are created.
PCM coding mainly includes three processes: sampling, quantization, and coding. ()
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 gateway in 502.H. 323 is between a circuit-switched network and a packet-switched network. ( )
The terminal recording request will be sent to the MCU, and then the MCU will uniformly record and broadcast the operation.
When forgotten HD end user and password can not log in to the web interface, can only restore factory settings.
The core of the NAT mapping is to modify the packet header (source address) to translate the source address into a NAT address ( ).
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 ( ).
In VR scenarios, the terminal cannot join the meeting ( ) in one of the following ways.
The SIP () was adopted in June 2002 , which is the core specification for the SIP protocol .
Video conferencing requires a color rendering index greater than ( ) for light sources
People convert the corresponding mechanical vibrations of sound into electrical signals, which are collectively referred to as audio signals.
A SIP message consists of a start-line header, a header consisting of one or more fields (riold), and a blank line that marks the end of the header ( CRLF) and as an optional message body (message
boby) consists of. ( )
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. ( )
During the MCU main control board backup reversal process, the conference and venue status on the SMC will be offline for about 10 seconds.
RAS messages are a type of message specified in the H.225.0 protocol, which is a protocol used between nodes and gateways to perform management functions, mainly including registration, access
control, and status.
In the Cseq header domain, Cseq is used to uniquely identify an invitation or a registration. ( )
H.323 is used to provide multimedia services in packet-switched networks. ( )
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 FEC forward error correction algorithm is an algorithm that sends redundant data at the sending end and recovers the code stream based on the redundant data at the decoding end.
The processing process of audio signal from input to playback mainly includes: analog audio signal input, sampling quantization/encoding, playback, decoding, transmission/ Storage.
In the default configuration of the firewall, traffic from a high-security network (intranet) to a low-security network (Internet) is generally not restricted, otherwise the firewall blocks.
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)
Diagnosis of peer-to-peer networks without networking traversed by public and private networks. ( )
As Huawei's video service management platform, SMC platform manages and schedules video conferencing in a unified manner. It can realize all the meeting control operations in the video conference, and can provide customers with a convenient and fast conference management experience.
Illuminance is based on the luminous flux received by the vertical surface as the standard, and if oblique illumination is used, the illuminance decreases. ( )
Image format refers to the size or resolution size of the image, common image formats include, SOCIF, QCIF, CIF, ACIF, 16CIF, HD, Full HD. ( )
Omnidirectional poetry is suitable for large conference rooms, and pointing pickup is suitable for small conference rooms.
RTCP can ensure the transmission quality well through RR, and each participant who receives data must send a RR.
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.
T.140 Subtitles support sending and receiving subtitles from SIP, H.323 type terminals.
In the Cilent/Server model, the primary function of request proxy server is to decide where to send signaling messages.
Call process signaling CALL PROCEEDING is a message sent by the caller to the called, indicating that the call is being processed.