You can send faxes to an outside fax number using # (hash) instead of the actual external access code such as 0 or 9.
Select Settings on the printer's control panel.
Select General Settings > Fax Settings > Basic Settings.
Select Line Type, and then select PBX.
Select the Access Code box, and then select Use.
Tap the Access Code input box, enter the external access code used for your phone system, and then tap OK.
Select OK to apply the settings.
The #, entered instead of the actual access code, is replaced with the stored access code, such as 0 or 9, when dialing. Using a hash (#) helps to avoid connection problems when connecting to an outside line, as the dial tone from the outside line is detected before making an outside call.
If you have registered recipients in Contacts using an external access code such as 0 or 9, set the Access Code to Do Not Use. Otherwise, you must change the code to # in Contacts.