I have a fax machine at one location (A) that fails about 75% of the time when sending to another specific location (B). It is faxing long distance from one service provider to another service provider.
Fax machine A has no trouble faxing any other location, be it long distance or local. It can even receive faxes from machine B.
Fax machine B has no trouble receiving or sending faxes to any location.
I've contacted Fax Machine A's service provider to check line quality, and they can find no issue. I've now contacted Fax Machine B's service provider, and am still awaiting results.
In the meantime, I was wondering if anyone had any suggestions for me to test?