Scanning, Faxing & Copying

I use my printer at home and I use my landline for both phone and fax calls.  I have been using this feature on my old HP OfficeJet 4500 for many years without any problem.  After I bought this all-in-one printer I set up the fax function shortly after purchase and set it up the same as the old printer (number of rings, etc.).  This problem has happened a couple of times since I set this printer up, but most recently on July 15th when I made an outgoing call and was placed on hold.  When I was transferred to the person I was calling, the fax answered as if it were receiving a fax.  It finally stopped after 42 seconds and the confirmation said "No fax detected".  I have also just picked up the phone to call out and got the fax noises for no reason.  I have looked at all the settings and I'm not sure if I have missed something that should be set or have something set wrong for the new printer.  Something that should be on or off?   Can anyone help me with this.  Thank you.