Common SIP calls the SDP negotiation process includes (). (3 answers).

Which of the following is a mixing strategy ( ).

The 245.H.460 protocol specifies that the public-private network traversal processing process for the H.323 media streaming portion is ( ).

The following description of static NAT is correct ( ).

The following description of the H.323 call flow is correct

Which of the following descriptions of SIP registrations is incorrect. ( )

Which of the following messages is used for endpoint registration ( ).

MP mainly completes which of the following functions. ( )

In video conferencing, the empty field noise is required not to be greater than ( ).

Under the static NAT networking, the packet of the private network terminal through the firewall will change, and the following description is wrong ( ).

RAS performs management functions, mainly including :() (3 answers).

In the Early state, the caller can end dialog0 by sending ( ).

Among the four elements of packet filtering that can generally be omitted by firewalls, the condition is. ( )

MP mainly completes those functions () later. (2 answers).

In the RTP specification (RFC3550), a total of ( ) types of RTCP reports are defined to report current control information.

For the relationship between photography and reflected light, how to use the reflected light of indoor decoration. ( )

The signal stream of the audio self-ring is. ( )

The GK side hangs up the call in case of ( ).

Dynamic dual-streaming, following the ( ) standard.

Under the video service, for public network calls to the private network can be changed to private network calls to the public network, the public and private network traversal technology used is generally ( ).

(2 answers).

VGA output is supported up to ( ) resolution.

Extended request message UPDATE , which is used to modify session properties during the call setup phase. ( )

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.

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.

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. ( )

AN INVITE transaction consists of a three-way handshake. The client transaction sends INVITE, the server transaction sends the response, and the client transaction sends an ACK, ( ).

Which of the following belongs to the extension request ( ).

The H.460 protocol specifies that H.323 signaling parts of the public-private network traversal are handled. ()

The color rendering index affects the color of the video image. ( )

Which of the following sockets on the MCU is the default service network port ( ).

H.225 contains which of the following signalings (). (2 answers).

Which of the following signalings is not an H.245 signaling. ( )

In video conferencing, local noise is required not to be greater than ( ).

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

In VR scenarios, the terminal cannot join the meeting ( ) in one of the following ways.

Which of the following networking methods does the MCU support?

Which of the following is the core specification of the SIP protocol?

By viewing the system information of Huawei terminals, we can view specifications such as voice, image, interface, and bandwidth.

In an RTP message, Timestamp reflects the sampling moment of the first bit in the RIP packet. The instantaneous accuracy of sampling must meet the synchronization requirements for synchronization and jitter calculations. The starting value of the time flag is random and will be incremented with the size of the message data.

When managing mcCuus on the web, in the Export item under the Device Management page, the following cannot be exported as ().

The role of the RTP protocol is ().

When accessing a specified meeting via IVR, what is the default IVR Unified Access Number?

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 primary purpose of 515.H.323 is to establish peer-to-peer media sessions and multipoint media conferences. ()

Which of the following protocol messages does Wireshark support decoding?

During software installation, GK can only be installed on the C or D disk of the operating system .

As shown in the figure, the RTCP instance flow includes SR, RR, and ( ) messages.

The H460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of (). (2 answers).

What factors does the quality of digital audio depend on?

Which of the following measures can users use to expand the video port of the VP9650 ?

Video compression includes intra-frame compression (I frame) and inter-frame compression (P frame), common H.26X, MPEG-2, MPEG-4 Both support in-frame/inter-frame compression.

Which one is wrong with the description of the VP9660 single board LEDs below?

Which of the following describes a policy that is not part of MCU audio mixing?

Reducing reverberation time can be achieved by covering walls, ceilings, windows, and floors with soft finishing materials.

PCM coding mainly includes three processes: sampling, quantization, and coding. ()

When GK agrees to a terminal's registration request, which of the following response messages is sent?

How many GKs can a region contain?

In the H460 network, the transmission keep-alive duration, keep-alive port, and keep-alive fields are in the signaling transmission stage. ()

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 values does the color rendering index required for video conferencing light sources need to be greater than?

What properties does the color rendering index affect on the color of a video image?

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

Illuminance, color temperature, white balance and color rendering index, these four indicators of light, have an important impact on the actual image effect of the video conference.

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?

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

SR messages in RTCP are send reports that describe sending and receiving statistics as sending gateways. ( )

SEC: Super Error Concealment is an anti-packet loss technique using the ARQ algorithm.

Mixing is actually mixing the loudest venues except for your own venue, not mixing all the venue sounds.

Banners are used to briefly display meeting content, and subtitles are used to highlight the meeting topic.

When using MCU wall riding mode, the terminal on the GE0 side can call the terminal on the GE1 side over IP.

Diagnosis of peer-to-peer networks without networking traversed by public and private networks. ( )

In the specification for RTP (RFC 3550), a total of () RTCP reports are defined as used to report current control information. (Fill in the blanks)

T.140 Subtitles support sending and receiving subtitles from SIP, H.323 type terminals.

GK's active-standby inversion is coordinated by a heartbeat connection.

The processing process of audio signal from input to playback mainly includes: analog audio signal input, sampling quantization/encoding, playback, decoding, transmission/ Storage.

A multi-screen conference needs to occupy the MCU one-way multi-screen encoding resources, and N sprites need N/2 multi-screen decoding resources.

A single value in the header field can only appear once in the message, such as Via, Route, etc. ( )

If both the sender and receiver () are the same, the MCU forwards directly. (3 answers).

CANEL transactions can be used for both CANCEL INVITE transactions and CANCEL non-INVITE transactions.

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 SIP protocol is the session initiation protocol for establishing, controlling, and releasing sessions. ( )

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.

In multimedia services, RTP is used for real-time datagram transmission and RTCP is used to detect the quality of service for an RTP session.

In the camera control of the WEB interface, only the local camera can be controlled, not the remote camera. ( )

Dialogs can be divided into INVITE transactions and non-INVITE transactions, where the INVITE transaction in turn includes a request message and a response message.

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. ( )

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.

During the work of the primary GK, the GK address registered by the terminal is the primary GK address.

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.