I am a funeral home business owner who recently installed a 3cx system. I am unhappy with our installer who can't seem to solve this issue and I am trying to fix it on my own. I have a ring group that is supposed to forward calls to an answering service (out of state/outside line) when there is no answer after 14 seconds. Most calls are properly forwarded, typically ones from area codes the same as out main lines. But other calls, typically cell phone calls from area codes other than the main line, do not forward and end up going to somewhere else and the caller gets a "this number is not in service" message. I makes no sense. and I can't find where in the system to make any changes or start over from.