US Robotics 56K Series Manual page 41

POSSIBLE SOLUTION
You may be trying to fax a compressed file. Decompress the file using the application
with which it was compressed. Then open it in the application with which it was created.
Select your fax software as the printer and then print the file.
PROBLEM
Your communications software fails to initialize the modem.
POSSIBLE SOLUTION
Your software's port settings may be incorrect. Make sure the software's port settings
match those for your modem.
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