Dial up Networking – Win98SE

I have Win98SE 40GB HDD/256MB also have a broadband connection and a regular Dial up Dialler which works okay. If I try to “Make New Connection” with using another Dial up ISP it makes a new connection, however when I try to “connect” with that error box says no dial tone detected error 680 install modem. I do not know why this happens, as previously I had no problems whatsoever using this extra Dial Up ISP, checked in MODEMS everything seems okay. If I insert the new ISP telephone number/ID/PW into the old ISP Dialler I can connect okay to this new ISP but I cannot make a new connection in Dial Up Networking. Please help. Regards – K Dholoo