The Mac Internet Setup Assistant is in the Assistants folder of the hard drive. Click on the modem list and select your modem. The two generic modems are the US Robotics Universal and the Hayes Optima. Click on the port list and select your port.
All Internal modems are on the modem port as well as most external modems.
As a general rule it will be Tone. Do not check the ignore dial tone unless they have problems with the dial tone or are on some kind of phone system that changes the dial tone. Their access number from the purple sheet. No Click Go Ahead to configure this connection.