Call waiting explained

The second caller hears the normal ringing, not the busy signal.

At the sound of the beep, quickly push the receiver button on your phone. (If you do not answer the second caller immediately, you will hear a final beep ten seconds later.) Pushing the receiver button also lets you switch from one caller to the other.

You can deactivate the Call Waiting service during an important call or data transfer. Make sure you do this when you are using a dial-up service because some modems cut off the Internet connection during an incoming call.

You must turn off this service before hearing the beep of an incoming call. It will be too late otherwise at the sound of the beep.