Macintosh Dial-up Settings for OS X
Click on the Apple and choose System Preferences
From the System Preferences window click the Network icon
From the Network window configure as follows:
Configure: Internal Modem

Under the TCP/IP tab...
Configure: Using PPP
IP Address: (Provided by PPP server)
Domain Name Servers: 216.223.173.12
216.223.173.10
Search Domains: rtcol.com

Under the PPP tab...
Service Provider: RTC on Line
Telephone Number: dial-up access number
Alternate Number: alternate dial-up (optional)
Account Name: RTC on Line user name
Password: RTC on Line password.
Select "Save Password".

Click the Save button at the bottom of the screen.

* PPP Options Button at the bottom of the screen offers settings such as:
> Connect automatically when starting TCP/IP application
> Disconnect when user logs out
> Disconnect times, etc.

To connect to the Internet
Once the configurations above have been completed connecting to the Internet can be done through the following steps:
1) Double click on the Mac Hard Disk icon on the desktop.
2 )Double click Applications and then double click Internet Connect.
3) Be sure the phone number and user name are listed properly and click the Connect button.