HP Officejet 6310 All-In-One InkJet Printer "fax report busy signal" Questions

...fax line check Hi, I am having problems receiving faxes. Senders report getting a busy signal on the phone line and a return of their faxes. We get a dial tone at the home office and can send faxes. ...

Fax Test report indicates all PASS - all connections are OK. I disconnected the credit card machine and switched the fax line with the phone line. No success. I do not have VoIP. When someone tries to

...fax mode then enter the number Next I press start then ok .ican hear the ring tone and after the connection is established i see on the display transmit led so far for the last 2 days I get a report ...