Which of the following VoIP commands correspond to their potentially devastating effects?

A.
The bye command causes VoIP devices to close down while in a conversation.

B.
The checksync command can be used to reboot VoIP terminals.

C.
The reset command causes the server to reset and reestablish the connection.

D.
The establish command causes an unauthenticated client to associate to a server.

Explanation:
Attackers can impersonate a server and issue commands such as bye,
checksync, and reset to VoIP clients. The bye command causes VoIP devices to close
down while in a conversation, the checksync command can be used to reboot VoIP
terminals, and the reset command causes the server to reset and reestablish the
connection, which takes considerable time. The establish command causes an
unauthenticated client to associate to a server.