A number of people have reported intermittent disconnection from the UBOSS telephone service. This leaves users unable to make or receive calls. I found that rebooting the router resumes connection but it does not last. Customer service are investigating.
I don't really use mine all that much to notice any outages, but I did have an issue where a caller tried repeatedly to call but received a message that the line was busy. It wasn't and my phone never rang. This was over a period of about four hours. I reported the incident to Support but they said they couldn't investigate as the problem had since resolved. :dunno: