Regarding Huawei Videoconferencing VME technology, which of the following descriptions is correct: () (multiple choice)
Which of the following signaling is included in a SIP call? () (multiple choice)
After the terminal initiates a call and sends an ARQ message to GK, it receives an ARJ message. The possible reason for the call rejection is () (multiple choice)
When the number of bills exceeds the limit of the number of bill pools of the U1900 unified gateway, which statement is correct? () (multiple choice)
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)
