Make the following settings when using the printer in offices that use extensions and require external access codes, such as 0 and 9, to get an outside line.
Select Settings on the printer's control panel.
To select an item, use the 
buttons, and then press the OK button.
Select Fax Settings > Basic Settings.
Select Line Type, and then select PBX.
When sending a fax to an outside fax number using # (hash) instead of the actual external access code, select Use as the Access Code.
The # entered instead of the actual access code, is replaced with the stored access code when dialing. Using # helps avoid connection problems when connecting to an outside line.
You cannot send faxes to recipients in Contacts in which an external access code such as 0 or 9 is set.
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.
Enter the external access code used for your phone system, and then press the OK button.
Press the OK button to apply the settings.
The access code is stored in the printer.