I have purchased a few Patton M-ATA FXS adapters for connecting some analog devices. I have experience with other brands and use them without issues on non-3CX installs. I purchased the Patton devices at a higher cost specifically because they are supported by 3CX. I have had nothing but trouble, blew most of my day messing with one these. I set it up on a new extension and got it to register and send/receive calls OK (I thought). Then I upgraded the firmware on it which removed the option to add STUN settings and broke registration to the 3CX box completely. Took me hours to figure out that was the issue. Once I downgraded the firmware to a slightly older version, my registration worked and I could make/receive calls again. I followed the 3CX articles that shows how to set this device up for a fax machine but, shouldn't be any different if I plug an analog phone in. Problem right now is that every call I make disconnects at exactly 32 seconds. This M-ATA is located on my home network and connects out o a public IP on the 3CX server. I do not really suspect my network or home router/firewall because I have several IP phones connecting to different servers with no issues including the same 3CX server I am trying to get this Patton to work on. I am at a loss, I have configured and used many ATA's over the years but I am stumped on this one. I find it odd that there are really very few configuration options in the Patton device in comparison to any other ATA I have used in the past. Some of the other settings are just downright confusing in my opinion and not what I have seen in other ATAs. Considering these cost me 3 times as much a similar Grandstream which always work well for me, I am not impressed so far. I am likely going to contact Patton tomorrow to see what they have to say but I thought I would throw this out on the forum here and see what others have experienced. I have searched Google and this forum until I am blue in the face but nothing has really helped. Thanks in advance for any suggestions.