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some us robotics modems don’t send CNG (calling) tones when sending a fax. CNG tones is the on – then off tone that you hear when sending a fax. Some fax machines require this tone to start the fax receiving process.

Try calling yourself with WinFax and answer the call, if you don’t hear anything, then your modem does not generate the CNG tones when sending faxes.

This will pose a problem with some fax machines that do not answer unless a CNG tone is heard.