工作英语对话:Making a Phone Call(3)

A: I want to make a phone call. Can you show me how?
B: Of course, pick up the receiver, hit a button and listen for a tone. Are you hearing it?
A: Yes, now what do I do?
B: Well, after you dial 9 on the keypad, you should hear the tone change.
A: No, nothing changed.
B: When you dial 9 and hear the tone change it means you have an outside line. Who are you trying to call?
A: I am trying to call my boss.
B: For an outside call you now just dial the number. For a company number you need to know the extension. Do you have a list of extensions?
A: I know a few extensions but I don't know all of them.
B: You can always look an extension up on the company website.