HP Officejet J5740 All-in-One Printer - Manual (Page 197)

When you have an answering machine on the same phone line you use for fax calls,
you must connect the answering machine directly to the HP All-in-One using the port
labeled 2-EXT, as shown below.
1 Telephone wall jack
2 Connect to the IN port on the answering machine
3 Connect to the OUT port on the answering machine
4 Telephone (optional)
5 Answering machine
6 Use the phone cord supplied in the box with the HP All-in-One
Make sure the HP All-in-One is set to receive faxes automatically and that the Rings
to Answer setting is correct. The number of rings to answer for the HP All-in-One
should be greater than the number of rings to answer for the answering machine. If
the answering machine and the HP All-in-One are set to the same number of rings to
answer, both devices will answer the call and fax tones will be recorded on the
answering machine.
Set your answering machine to a low number of rings and the HP All-in-One to answer
in the maximum number of rings supported. (The maximum number of rings varies
by country/region.) In this setup, the answering machine will answer the call and the
HP All-in-One will monitor the line. If the HP All-in-One detects fax tones, the HP All-
in-One will receive the fax. If the call is a voice call, the answering machine will record
the incoming message.
To set the answer mode
1. Press Setup.
2. Press 4, and then press 2.
This selects Basic Fax Setup and then selects Rings to Answer.
3. Enter the appropriate number of rings by using the keypad, or press or to
change the number of rings.
4. Press OK to accept the setting.
Fax troubleshooting 195