In video conferencing system, we have two way to prevent packet loss, one is FEC, the other is ARQ. ( )
Answer(s): A
In Multi-channel Cascading, the priorities at using the multiple channels is ( ).
Answer(s): B
A GK sends a/an ( ) message to an upper-level GK for address resolution request.
Answer(s): D
In video firewall mode, the endpoint connected to the GEO port can call the endpoint connected to the GE1 port by IP address.()
Response Messages "4xx" Indicate that the request message contains syntax errors or the SIP server cannot process the request message. ( )
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