If you use a PBX or ISDN converter or terminal adapter, then follow these steps to connect the equipment:
1Connect one end of the telephone cable that came with the printer to the LINE port 
on the back of the printer.
2Connect the other end of the telephone cable to the port designated for fax and telephone use.
Notes:
•Make sure the terminal adapter is set to the correct switch type for your region.
•Depending on the ISDN port assignment, you may have to connect to a specific port.
•When using a PBX, make sure the call waiting tone is off.
•When using a PBX system, dial the outside line prefix before dialing the fax number.
•For more information on using the fax with a PBX system, see the documentation that came with your PBX system.
Connecting to a Distinctive Ring Service
There is a plug installed in the EXT port 
of the printer. This plug is necessary for the proper functioning of the printer.
Note: Do not remove the plug. If you remove it, other telecommunications devices in your home (such as telephones or answering machines) may not work.
A distinctive ring service may be available from your telephone service provider. This service allows you to have multiple phone numbers on one telephone line with each phone number having a different ring pattern. This may be useful for distinguishing between fax and voice calls. If you subscribe to a distinctive ring service, follow these steps to connect the equipment:
1Connect one end of the telephone cable that came with the printer to bottom LINE 
jack on the back of the printer.
2Connect the other end of the telephone cable to an active analog telephone wall jack.
Faxing
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