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質問 1：
In a voice conference, participants access the conference system and conduct voice communication and discussion with each other. The conference organizer can hold scheduled and instant conferences.
A. TRUE
B. FALSE
正解：A
質問 2：
After the U1900 PRA trunk is faulty, you can run the show pralink command to view the circuit status of the board.
A. TRUE
B. FALSE
正解：B
質問 3：
U1900 series unified gateways are at the access layer in the eSpace UC solution.
A. TRUE
B. FALSE
正解：B
質問 4：
Which of the following statements are CORRECT about the PRA protocol? (Multiple Choice)
A. The standard protocol used at the data link layer is Q.921.
B. The protocol consists of the physical layer, data link layer, and network layer.
C. The standard protocol used at the network layer is Q.931.
D. The protocol is used for link multiplexing and error detection at the physical layer.
正解：A,B,C
質問 5：
In U1900 series unified gateway, which of the following models supports dual main control board? (Multiple Choice)
A. U1911
B. U1981
C. U1980
D. U1960
正解：B,C
質問 6：
When the U1900 PRA trunk is faulty, you need to check whether the indicator on the SCU board is normal.
A. TRUE
B. FALSE
正解：B
質問 7：
If two IP phones A and B register with the same U1960, which of the following statements is CORRECT?
A. If the U1960 encounters a power outage, the ongoing call (if there is any) between IP phones A and B is disconnected immediately.
B. If U1960 encounters a power outage, neither IP phone A nor IP phone B can initiate new calls.
C. Media streams of A and B need to pass through U1960.
D. In a call between IP phones A and B, the flow path for signaling streams is the same as that for media streams.
正解：B
In a voice conference, participants access the conference system and conduct voice communication and discussion with each other. The conference organizer can hold scheduled and instant conferences.
A. TRUE
B. FALSE
正解：A
質問 2：
After the U1900 PRA trunk is faulty, you can run the show pralink command to view the circuit status of the board.
A. TRUE
B. FALSE
正解：B
質問 3：
U1900 series unified gateways are at the access layer in the eSpace UC solution.
A. TRUE
B. FALSE
正解：B
質問 4：
Which of the following statements are CORRECT about the PRA protocol? (Multiple Choice)
A. The standard protocol used at the data link layer is Q.921.
B. The protocol consists of the physical layer, data link layer, and network layer.
C. The standard protocol used at the network layer is Q.931.
D. The protocol is used for link multiplexing and error detection at the physical layer.
正解：A,B,C
質問 5：
In U1900 series unified gateway, which of the following models supports dual main control board? (Multiple Choice)
A. U1911
B. U1981
C. U1980
D. U1960
正解：B,C
質問 6：
When the U1900 PRA trunk is faulty, you need to check whether the indicator on the SCU board is normal.
A. TRUE
B. FALSE
正解：B
質問 7：
If two IP phones A and B register with the same U1960, which of the following statements is CORRECT?
A. If the U1960 encounters a power outage, the ongoing call (if there is any) between IP phones A and B is disconnected immediately.
B. If U1960 encounters a power outage, neither IP phone A nor IP phone B can initiate new calls.
C. Media streams of A and B need to pass through U1960.
D. In a call between IP phones A and B, the flow path for signaling streams is the same as that for media streams.
正解：B
菊地** -
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