Increasing the Modem Timeout
If your modem it timing out during file transfers or loading Web Pages, you
might try increasing the timeout period.
To change it:
Go to HKEY_LOCAL_MACHINE / System / CurrentControlSet / Services / Class
/ Modem / XXXX / Settings
Where XXXX is the number of your modem
Move to the right panel and double click on Inactivity Timeout
The number of minutes for a timeout should be entered between the brackets.
For example, a US Robotics Sportster could have S19=<30> to set it
to 30 minutes.