Double click on My Computer

Click on Dial Up Networking

Click with the Right Mouse button on the Internet Primus icon then click on Properties

 
 

Make sure the General tab is selected from the different tabs across the top of the page.

Click on the Configure button

 

Click on the Connection tab
 
 
 

Click on the Advanced button

 

Place the modem string the Extra Settings box

 

 

Click OK and then click OK and click OK again until your back in windows