7520 can send faxes but can not receive faxes

Question

We just installed the 7520 and everything seems to work fine except receiving faxes. 
We can send faxes just fine, however the strange thing is when I try to call the fax number from a phone it acts like its dead, you never hear it ring or anything then it just disconnects. If I switch the phone cord to the Ext connection in the back of the device and then call the number I can hear it ringing on the calling phone and on the 7520 device.  The display lights up because there is an incoming call and shows that auto answer is on, but when it answers we never hear the normal fax type tones and it never connects.
The phone is being supplied by Time Warner Cable and it plugs into the cable modem. We called Time Warner and they told us that the line for the fax is an analog line but I have no idea how to check that or prove that.
I can't figure out why it will send faxes with no problem but seems like its a dead line when trying to receive a fax.
Any thoughts?
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Answer 1

With the printer's phone cord connected to the wall jack and the "1-Line" {nothing plugged into the 2-Ext} port, try running the Fax Test.  See Step 5.  Does everything pass?
Make sure the Distinctive Ring option is set for All Rings unless you have a distinctive ring set up with your phone service provider.
If you use a filter for your telephone, try using a filter for the printer.
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