Faxing I am able to fax out but can not receive faxes?

To change fax confirmation
1. Press Setup.
2. Press Print Report, and then Fax Confirmation.
3. Press the right arrow button to select one of the following, and then press OK.

Off - Does not print a fax confirmation report when you send and receive
faxes successfully. This is the default setting.

On Fax Send - Prints a fax confirmation report for every fax you send.
On Fax Receive - Prints a fax confirmation report for every fax you receive.
Send & Receive - Prints a fax confirmation report for every fax you send and receive.

You can receive faxes automatically or manually. If you turn off the Auto Answer option, you must receive faxes manually. If you turn on the Auto Answer option (the default setting), the device automatically answers incoming calls and receives faxes after the number of rings that are specified by the Rings to Answer setting. (The default Rings to Answer setting is five rings.)
If you receive a legal-size fax and the device is not currently set to use legal-size paper, the device reduces the fax so that it fits on the paper that is loaded. If you have disabled the Automatic Reduction feature, the device prints the fax on two pages.
NOTE: If you are copying a document when a fax arrives, the fax is stored in the
device memory until the copying finishes. This can reduce the number of fax pages stored in memory.
This section contains the following topics:
• Receive a fax manually
• Set up backup fax reception
• Reprint received faxes from memory
• Poll to receive a fax
• Forward faxes to another number
• Set the paper size for received faxes
• Set automatic reduction for incoming faxes
• Block junk fax numbers
• Receive faxes to your computer (Fax to PC and Fax to Mac)
Receive a fax manually
When you are on the phone, the person you are speaking with can send you a fax while you are still connected. This is referred to as manual faxing. Use the instructions in this section to receive a manual fax.
NOTE: You can pick up the handset to talk or listen for fax tones.
You can receive faxes manually from a phone that is:
• Directly connected to the device (on the 2-EXT port)
• On the same phone line, but not directly connected to the device
NOTE: The automatic document feeder must be empty to receive a fax. If there are documents in the ADF, then the device will not be able to receive incoming faxes.
To receive a fax manually
1. Make sure the device is turned on and you have paper loaded in the input tray.
2. Remove any originals from the document feeder tray.
NOTE: The automatic document feeder must be empty to receive a fax. If there
are documents in the document feeder, then receiving the fax will be
unsuccessful.
3. Do one of the following to answer a fax manually:
• Set the Rings to Answer setting to a high number to allow you to answer the
incoming call before the device answers.
• Turn off the Auto Answer setting so that the device does not automatically
answer incoming calls.
4. If you are currently on the phone with the sender, instruct the sender to press Start on their fax machine.
5. When you hear fax tones from a sending fax machine, do the following:
a. Press START FAX Black or START FAX Color on the device control panel.
b. When prompted, select Fax Receive.
NOTE: Depending on your country/region, the device might receive the fax
automatically when you hear fax tones from the sending fax machine.
6. After the device begins to receive the fax, you can hang up the phone or remain on the line. The phone line is silent during fax transmission.

If you require printed confirmation that your faxes weresuccessfully sent, follow these instructions to enable fax confirmation beforesending any faxes. The default fax confirmation setting is Off. This meansthat a confirmation report is not printed for each fax sent or received. Aconfirmation message indicating whether a fax was successfully sent appearsbriefly on the control-panel display after each transaction. NOTE: You can include an image of the first page of the faxon the Fax Sent Confirmation report if you choose On Fax Send or Send &Receive, and if you scan the fax to send from memory To enable fax confirmation
1.Press the (Setup) button.
2.Press right arrow to select Print Report, and then press OK.
3.Press right arrow to select Fax Confirmation, and then press OK.
4.Press right arrow to select one of the following, and then press OK. Off Does not print a fax confirmation report when yousend and receive faxes successfully. This is the default setting. On Fax Send Prints a fax confirmation report for every faxyou send.
OnFax Receive Prints a fax confirmation report for every fax you receive.
Send& Receive Prints a fax confirmation report for every fax you send andreceive

If you need printed confirmation that your faxes were successfully sent, follow these instructions to enable fax confirmation before sending any faxes. Select either On Fax Send or Send & Receive.

The default fax confirmation setting is Off. This means that the HP All-in-One will not print a confirmation report for each fax sent or received. A confirmation message indicating whether a fax was successfully sent appears briefly on the display after each transaction.

To enable fax confirmation from the control panel

1. Press Setup.

2. Press 2, and then press 3.

This selects Print Report and then selects Fax Confirmation.

3. Press to select one of the following, and then press OK.

Off Does not print a fax confirmation report when you send and

receive faxes successfully. This is the default setting.

On Fax Send Prints a fax confirmation report for every fax you send.

Fax

On Fax Receive Prints a fax confirmation report for every fax you receive.

Send & Receive Prints a fax confirmation report for every fax you send and

receive.

This is an excerpt of the User's Guide for your machine. You can download from here:
http://h10025.www1.hp.com/ewfrf/wc/manualCategory?lc=en&dlc=en&cc=us&product=1138342&


Print fax confirmation reports
If you need printed confirmation that your faxes were successfully sent, follow these instructions to enable fax confirmation before sending any faxes. Select either On Fax Send or Send & Receive.
The default fax confirmation setting is Off. This means that the HP All-in-One will not print a confirmation report for each fax sent or received. A confirmation message indicating whether a fax was successfully sent appears briefly on the display after
each transaction.
To enable fax confirmation from the control panel
1. Press Setup.
2. Press 2, and then press 1.
This selects Print Report and then selects Fax Confirmation.
3. Press to select one of the following, and then press OK.

Off Does not print a fax confirmation report when you send and
receive faxes successfully. This is the default setting.
On Fax Send Prints a fax confirmation report for every fax you send.
On Fax Receive Prints a fax confirmation report for every fax you receive.
Send & Receive Prints a fax confirmation report for every fax you send and receive.
User Guide 65
Fax
Tip If you choose On Fax Send or Send & Receive, and scan your fax to send from memory, you can include an image of the first page of the fax on the Fax Sent Confirmation report. Press Setup, press 2, and then press 2 again. Select On from the Image on Fax Send Report menu.

Problem lies in your Receive Mode setting. If you don't have a dedicated phone line for the fax machine, you need to set it up for either Manual where you answer every call or Fax/Tel whereby the Fax machine determines if the incoming call is a fax or phone call. Instructions per Intellifax 4100 Manual.

Select a Receive Mode
Choose the mode that best suits your needs by pressing the Mode button
repeatedly until the FAX and FAX/TEL lights show the setting you want to use.
Manual
You must answer every call yourself.
The Brother machine must be started manually
to receive faxes.
Fax
For use with a dedicated fax line.
Every call is answered as a fax.
Fax/Tel
For receiving fax and voice calls on one line.
The FAX answers every call and receives a fax or
double rings for you to pick up a voice call.
TAD
For use with an answering device.
The TAD answers every call and stores voice messages.
Fax messages are printed.

What is the make and model?

Call the fax machine from a regular phone to see if it answers.

I think you have some sort of phone line problem.

Fax machine modems are good or bad, nothing in-between.

Make sure the receive faxes button is set properly. If it is not set to fax only, you will need to manually receive faxes, the machine will not auto answer.

You can get the manual here if you do not have one - LINK.

Here is an exert form the manual on this:
Print fax confirmation reports
If you need printed confirmation that your faxes were successfully sent, follow these
instructions to enable fax confirmation before sending any faxes. Select either On
Fax Send or Send & Receive.
1. Press Setup.
2. Press 2, and then press 1.
This selects Print Report and then selects Fax Confirmation.
3. Press to select one of the following, and then press OK.
Off Does not print a fax confirmation report when you send and
receive faxes successfully. This is the default setting.
On Fax Send Prints a fax confirmation report for every fax you send.
On Fax Receive Prints a fax confirmation report for every fax you receive.
Send &
Receive
Prints a fax confirmation report for every fax you send and
receive.

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