問題文
A branch office reaches its call control across a long-distance link, and a technician reads what the router in that branch does for the telephones while that link is out of service. Which statement is correct?
選択肢
- The router takes over the handling of calls for the telephones that sign on with it, it settles itself into that part of its own accord, and the handling goes back to the far call control once the link is up again.
- The router takes over the handling of calls, though it has to be set up for that part beforehand by hand, and the handling goes back to the far call control once the link is up again.
- The branch router picks up the calls of the telephones that have signed on with it, it falls into that part of its own accord, and the work stays where it is until a technician moves it back by hand after the link is up again.
- The telephones fall silent for as long as the link is out, and the router keeps a record of the calls that were tried so that they can be placed again later.