Hello again, I cannot get a Zoom 5800 ATA to register with 3CX. I think I have everything configured correctly, yet, in 3CX, the External line never goes green. Does anyone have a Zoom 5800 that is currently working with 3CX? If you would like to take a stab at it, please send me a message and I can give you access to both the ATA and the 3CX management screen. The Zoom 5800 is a low cost VoIP Gateway and I can see more people using it, if we can get it working. It is a single FXS , single FXO Gateway and only cost me $58 on ebay (Brand New). Thanks..