Hi i'm an ex HP employee
i got this information from HP's website
this is the link http://h10025.www1.hp.com/ewfrf/wc/document?docname=bpu02151&lc=en&cc=us&dlc=en&product=441125&rule=2043
Phone company services: Do you have any of the
following telephone line services from your telephone company: Voice Mail,
Privacy Block, Security Screen, Anonymous Call Rejection, and Privacy Manager.
These phone services are meant to prevent unwanted
calls, but they will also stop faxes. Contact your telephone company for their
recommended solution for receiving faxes on the same line with these
If you wish to receive faxes automatically, verify
that automatic answering is enabled on models that have an Auto Answer button, or that the Rings to
Answer setting is set to a number equal to or larger than one for models that do
not have an Auto Answer button. On models with an Answer Mode setting, it should
be set to Fax, FaxTel, or AnswerMachine depending on your setup.
If you have a HP PSC 2200 or an Officejet 6100 that
interrupts calls or will not receive faxes, download and install the HP Firmware
update for these products.
Visit the HP Support and Drivers Home
Select Download drivers and software .
Type in your model number (HP PSC 2210xi for
Click the search arrow to the right of the text
You may be asked to select your product from a list
On the software download page, select your Windows
Locate and select the firmware update.
Follow the directions to download and install the
If an answering machine is connected to the same
line, fax reception problems can occur. These problems may be corrected by
changing settings or phone line connections. For more information on using a TAM
or distinctive ring service, go to Using
the HP All-in-One and Fax Products with a Telephone Answering Machine
If you have a PBX phone system, or an ISDN or DSL
modem connected to the line, there may be some phone line configuration
problems. Fax machines are analog devices and cannot be used on a digital phone
service such as those used in many businesses (PBX systems). Install an analog
phone line for a fax machine. Refer to document Using
an HP All-in-One or Fax Product on a PBX, ISDN, or DSL Phone System
(bpu50333) to learn how to correct these problems.
If the problem still exists, continue troubleshooting in the Faxes cannot be sent or
received or you're not sure of the problem section below .
hope it works out