Savin 9050spf Fax Issue

I wish customers could give you the whole story the first time they call. I found out that this issue only happens when the customer is receiving a fax from one vendor. They would receive multiple copies of the same page from this one vendor.There would be an intermittent disconnect of the handshake between the two faxes. I suggested they put a line conditioner on the fax line. They already have that. They have an older Savin 4035spf that the faxes do receive from this one vendor. I also suggested they change lines, and also change the phone cord. I can't tell them to check with the phone company, because this customer is the phone company.

Turned out to be line condition problems with the vendor, not with the machine. Guess I ought to try to sell their vendor a new fax machine.