We have an S8300 CM3 and from yesterday we have been experiencing a strange problem. This applies to all extensions. When you transfer a call to another ext and it is not answered and you take it back the ext you tried to transfer keeps ringing. I have tried rebooting the system with reset system 4, but the problem persists. Unfortunately my knowledge with CM is very limited and my colleague with experience is on leave with no ability for remote support. Any ideas what might be the problem?