The sound test is to test whether the terminal audio output is correct.

In June 2002, SIP was adopted (), which is the core specification for the SIP protocol.

A short message is one that can send ( ) messages to a designated venue or to all venues for inter-venue communication and information prompting. (Fill in the blanks)

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.

The SIP protocol's flexible scaling mechanism refers to the addition of header domains and message types.