Today, without notice or reason 3CX decided to let incoming calls ringing in on our Patton 4114 devices - just kept ringing - no answer - all 8 lines. Is there a reason? What would I look for? The 3CX server, Cisco switch, firewall (network default gateway) and Patton boxes are all UPS protected and have always been on. You could see the LED's blinking on the patton's and I could listen in on a butt set - so it's not a line connection problem. A restart of the 3CX services (via the management website) resolved the problem. All 3CX services were running. We already use ipMonitor to check and restart any service that stops, problem is they all appeared ok. Is there any other keep-alive or check I can do? How about some watchdog type process? If I switch all these POTS lines to a VoIP provider, am I going to be any happier by A) not having this problem and B) not having any echo problems at the begining of calls?