H11-879 Online Practice Questions and Answers

Phone A has been successfully registered to the U1900 system. At some point, unplug the network cable. At this time, log in to the U1900 system to check the registration status of phone A. The following statement is wrong ()

A. The registration status of phone A in the U1900 system may change immediately

B. The registration status of phone A in the U1900 system may remain unchanged

C. The registration status of phone A in the U1900 system may change after a period of time

D. The registration status of phone A in the U1900 system is updated, only after the network cable of phone A is unplugged, the change occurs after half of the registration period of phone A has passed

In the central networking mode of the converged conference MCU, what is correct about the traversal of public and private networks? () (Multiple selected)

A. TE/RP/TP access MCU through SC proxy signaling and media stream

B. eSpace Mobile accesses MCU C through SBC proxy audio and video media.

C. External web client access MCU through MS proxy audio and video

D. eSpace PC connects to MCU through SC proxy signaling and media stream

The U1900 system is connected to the PSTN through a digital trunk. In U1900, phone A cannot call user B's On mobile phone, user B can call back phone A normally. Which of the following reasons may cause this failure? () (single choice)

A. The digital trunk connection between U1900 and PSTN is faulty.

B. Phone A is not registered properly.

C. Phone A outbound call permission restriction

D. Phone A has been added to the system's blacklist of called parties

In the SIP session service, which of the following methods is used by the called terminal to realize the interaction of media capabilities? () (single choice)

A. In the 100 trying message, carry the called SDP media capability

B. In the 180 or 183 session progress message, carry the called SDP media capability

C. In the 200 OK message, the called SDP media capability is carried

D. Confirm in the ACK message

An enterprise has purchased 3 U1960s, and the number of IP phone users is about 2500. Which networking method is suitable for these 3 U1960s? () (single choice)

A. Multi-node centralized call management networking

B. Peer-to-peer distributed call management networking

C. Convergent Distributed Call Management Network

MCU adopts built-in web mode to manage and control, realize the function of () (multiple choice)

A. Terminal registration

B. Intelligent access to various types of terminals

C. Meeting convened

D. Conference control

In the H.460 public and private network traversing dual SC networking, the communication between the terminal and Client GK follows the () protocol (Single choice)

A. H.460

B. H.323

C. H.460.18/19

D. Q.931

H.264 encoding, the main reason for blocking is () (single choice)

A. The macro block is in the intense motion area, the difference is big, resulting in obvious edges

B. The quantization level of the coding block jumps, resulting in sudden brightness changes at the boundary

C. Unreasonable division of macroblock coding modes, resulting in false edges

D. Deblocking filter (Deblocking) is not strong enough, resulting in not smooth edges