converter, try using the port designated for multiple purposes; it might be labeled "multi-combi" or something similar.
●If you are using a PBX phone system, set the call waiting tone to "off".
Note Many digital PBX systems include a call-waiting tone that is set to "on" by default. The call waiting tone will interfere with any fax transmission, and you will not be able to send or receive faxes with the HP All-in-One. Refer to the documentation that came with your PBX phone system for instructions on how to turn off the call-waiting tone.
●If you are using a PBX phone system, dial the number for an outside line before dialing the fax number.
●Make sure you use the supplied cord to connect from the telephone wall jack to the HP All-in-One. If you do not, you might not be able to fax successfully. This special phone cord is different from the phone cords you might already have in your home or office. If the supplied phone cord is too short, you can purchase a coupler from your local electronics store and extend it.
Case D: Fax with a distinctive ring service on the same line
If you subscribe to a distinctive ring service (through your telephone company) that allows you to have multiple phone numbers on one phone line, each with a different ring pattern, set up the HP All-in-One as described in this section.
setup Finish
Back view of the HP All-in-One
1 
Telephone wall jack
2 Use the phone cord supplied in the box with the HP All-in-One to connect to the "1-LINE" port
To set up the HP All-in-One with a distinctive ring service
1.Using the phone cord supplied in the box with the HP All-in-One, connect one end to your telephone wall jack, then connect the other end to the port labeled 1- LINE on the back of the HP All-in-One.