This error is most likely caused by the user's modem.
First make sure that the modem is connected to the phone lines correctly
and if it is an external modem make sure that the serial cable is connected to
the right COM port and that the cable is not tangled
Then check if the error occurs regularly or has only happened once.
If it only happened once then make sure the user's port speed is not set
too high.
MAX Values:
57600 for 56k modems
38400 for 33.6k modems
19200 for 14.4 modems
If it happens regularly, check the port speed as above and then try these
strings:
AT&F1
ATZ&B0&C1&D2
If these have no effect then check that the modem is installed. Make sure
that the driver installed matches the modem exactly. If not reinstall the
modem (be careful of WinModems as they often have complicated installation
procedures)
If the modem is installed correctly, check that it is responding properly.
Go to Control Panel, then Modems. Click on the Diagnostics tab. Highlight the
COM port the modem is on and then select More Info. If the modem does respond,
check it further by dialling using Hyperterminal.
If the modem fails any of these tests, get the modem checked by the
manufacturer. If the modem passed all of these tests, try reinstalling DUN/RAS
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