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 ( ).
Under the video service, the public network call private network is not accessible, and the public and private network traversal technology used is generally the same as the private network call public network
A short message is when a message ( ) can be sent to a designated venue or to all venues for inter-venue communication and information prompting.
Call process signaling CALL PROCEEDING is a message sent by the caller to the called, indicating that the call is being processed.
Which of the following messages indicates that the request cannot be implemented on any SIP server . ( )
The configuration of the 3G network of hd terminals, the following statement is correct.
The terminal reads the camera data by ( ).
The MCU supports ( ) web users logging in at the same time.
The environment of the display area requires low illumination, and the reasons for the lower illumination required at the digital projection screen are ( ).
In video conferencing, local noise is required not to be greater than ( ).
The advantages of static NAT include. ( )
The color rendering index affects the color of the video image. ( )
H.225 contains which of the following signalings ( ).
VGA output is supported up to ( ) resolution.
The role of the LAN2 port of the HD terminal is ( ).
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