A client is using a US Robotics Sportster 56K modem to collect email. They are getting RAS error 633 most of the time. I have made sure service pack 6a is installed.

Does anyone have any idea if this is a Windows problem or the modem or the ISP?

I have a feeling it is the ISP (BT) as they have just changed to them. They were connecting to Freeserve and got the error occasionally.

Thanks in advance,

Mike.