Hey guys ! this one has been hanging for some time but I feel the hardware is working fine. We have fax service installed on a 3CX v9 setup along with a Grandstream HT503 ( t.38 ) PSTN Gateway. We are able to receive faxes but only one page goes trough. That first page is sharp and no distortion on the image so the line signal must not be causing this issue. We looked on the "disconnect" settings on the HT503 but could not get better results. Always one page when receiving from a remotr hardware fax trough PSTN. We managed to get a full 6 pages fax to pass trough once with an online free fax service, I am guessing the digital system they use might be communicating some other way. I have been told the HT503 had problems with 3CX fax but since we get 100% success on the first page, there has to be a way to fix the problem. Anyone ?