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Select PBX in Settings > General Settings > Fax Settings > Basic Settings > Line Type on the control panel.
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If your phone system requires an external access code to get an outside line, register the access code to the printer, and enter # (hash) at the beginning of a fax number when sending.
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Check that the recipient's number registered in your contacts list or that you entered directly using the keypad is correct. Or, check with the recipient that the fax number is correct.
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Ask the recipient if the recipient's fax machine is ready to receive a fax.
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You can send faxes at a smaller data size using one of the following methods.
When you send the fax in monochrome, enable Direct Send in Fax > Fax Settings > Fax Send Settings.
Using the connected phone
Separating the originals