I have experienced the cut-off problem with 11.1 but when I changed the seconds of silence and those times. The problem went away. The callers were getting cut-off and then going right to dial-tone. I got some technical documentation from the Comdial Customer Care Center Tech support page. I couldn't tell you the number right off of the top of my head I will have to look for it. As for the time it takes for the Voice Mail system to come back up so that the phone system recognizes it. I was always told that it can take up to 15 minutes for it to come up. This probably doesn't help much at all I wish I could tell you more but I have never really encountered the problem to that degree.