Question 81
According to the H.323 protocol, a message sent by the caller to the caller indicates which message ( ) the called user has off-hooked.
Question 82
The following description of the cascading characteristics of the miniMCU is correct. () (3 answers).
Question 83
Any SIP message consists of a starting line, a header field, and a message body, and the header domain must end with CFLF (Carriage Return Line Feed).
Question 84
The 268.H.460 protocol is a firewall/NAT traversal standard approved by the ITU of the International Telecommunication Union and consists primarily of ( ).
Question 85
The system uses the H.245 protocol as the control protocol for controlling the communication channel. ( )