No, my phone system is too old and too busy for that.
Whoever was sending us a fax to our busy fax number was frustrated enough to try sending it to our voice line number instead.
So the receptionist answers the phone and gets the screech. That's what let me know we could use another fax line.
Now Updox makes sure every fax is answered by backing up the fax server. The fax server answers 3-4000 faxes a month and keeps all those faxes that are delay call forwarded to Updox less than the 500 included in their monthly fee.