This error is most likely caused by the user's modem.
First 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 get the user to have their modem checked out by the manufacturer.
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