H.323 During the call flow, the MCU records the registered address of the terminal.
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 Network Diagnostic Tool supports diagnostics in peer-to-peer networks where there is no networking traversed by public and private networks.
TCSA refers to the capability exchange success response, which is used to return to the local side after the ability exchange is successful.
A rackmount MCU can have two main control boards, support master-standby switching, and only need to configure one IP address.
In a networking network, what is the code flow hole between the public network and the private network terminal maintained? ( )
If the meeting scheduled by the user is not held on time, which of the following measures can be taken to solve this problem?
Horizontal viewing is the angle between the audience's eyebrows and the ends of the screen in a horizontal direction.
Illuminance, expressed in terms of the luminous flux accepted per unit area, is expressed in lux (Lux , lx ). ( )
As can be seen from the figure, the venue can not receive remote venue video in the meeting, what measures can the user take to locate the cause of the failure?
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.
Video conference room integration refers to the end-to-end solution () that uses corresponding equipment to meet the user's requirements for various scenarios in the conference room in accordance with certain design principles in the construction of the conference room
Sendto[(218.5.64.98:18616)][59285094444][0x00000065:err_reg_wrong_account_or_password]] From the above logs, you can tell that the reason for the registration failure is ().
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. ()
A firewall is one that protects a network from attacks by "untrusted" networks, but at the same time must also allow legitimate communication between two networks
In the MCU Web page, the format of the exported address book information is ( ).
Under static NAT networking, the SRC address of the terminal under the private network changes to ( ).
The following description of the relationship between the RTCP port number and the RTP port number is correct ().
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
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 ( ).
During the terminal registration GK phase, the UDP header in the RRQ registration request message contains the following information ( ).
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
Under static NAT networking, the signaling description of the public network terminal calling the private network terminal is wrong? ( )
Under the static NAT networking, the packet of the private network terminal through the firewall will change, and the following description is wrong ( ).
In audio encoding, which of the following is a speech quality metric. () (3 answers).
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.
A CANCEL transaction can only be received after receiving an ad hoc response from INVITE (including 100 ). The final response is sent before. ( )
In the SMC2.0 system, which of the following user rights has the highest level.
The system uses the H.245 protocol as the control protocol for controlling the communication channel. ( )
Message is the basic unit of the SIP protocol, the basic unit of interaction between the client and server sides
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.
TCs are capability exchange requests that inform the peer of the capability information ( ).
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. ()
NLOG supports viewing historical network data for event venues within the conference ().
The primary purpose of 515.H.323 is to establish peer-to-peer media sessions and multipoint media conferences. ()
Header domains carry the properties of SIP entities, message bodies, and so on.
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.
Color temperature affects the reproducibility of the color of the video image, the higher the color temperature, the more color. ( )
A single value in the header field can only appear once in the message, such as Via, Route, etc. ( )
The terminal auxiliary IP is designed so that users can log in to the terminal configuration or debugging in the LAN, which can be used for main business. ( )
The role of RTP in VoIP mainly includes: real-time transmission of media information, elimination of jitter, card performance, prevention of packet loss, in a certain situation can be transmitted DTMF signals,
tones and signaling.
CANEL transactions can be used for both CANCEL INVITE transactions and CANCEL non-INVITE transactions.
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. ( )
In a multipoint meeting, users can initiate an operation that deprives the demo token from any venue.
Users can call a conference access number and then create a video conference based on the IVR prompts.
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.
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 the Contirmed state, both the caller and the caller can end dialog through ByE. ( )
The alarm light on the MCU dashboard is red and the meeting is scheduled to prompt "License resources are insufficient", possibly because of the MCU The license does not match the actual hardware
configuration of the MCU.
Among the four elements of packet filtering that can generally be omitted by firewalls, the condition is. ( )
During point-to-point calls under different GKs, LRQ uses GK routing prefixes to query neighbor GK for information about the called node.
T140 captions are sent separately to the remote venue, displayed on the remote venue monitor, and superimposed on the local video image.
When sending and receiving T.140 subtitles, both parties who need to join support T.140 subtitles.
Which of the following messages indicates that the request cannot be implemented on any SIP server . ( )
The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.
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. ( )
In the MCU's web page, the format of the exported address book information is ( ). (Fill in the blanks)
In video conference rooms, the illuminance cannot be too low because whether it is a CCD or CMOS, the camera will have a lot of snowflake noise in low light.
People convert the corresponding mechanical vibrations of sound into electrical signals, which are collectively referred to as audio signals.
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.
HCNP-VC |
TESTED 03 May 2024
