This is something that bugs me alot. This only happens sometimes. I will do it several times during the day, but seam to be more frequent in the evenings. Our phone system rings and when you pick up the hand set. It displays hang up. Then a couple seconds later it begins to ring again. Usually, it will connect on the second attempt however sometimes this happens 5 or 6 times. When you finally talk to the person on the other end, they say the phone had been ringing for a while, continuously. It usually only happens on line 1 the main line, but it might happen on line 2 on occasion. It hard to tell since if line 1 is busy, it goes to the line 2. There is no line 3 but it has never happened on line 4. There are a lot of factors at play here. 1. This started a while after we switched to VOIP, but not right away. Maybe a couple months 2. The Alarm system was replaced/upgraded about the same time as going VOIP 3. Unplugging the alarm from the hard phone line doesn't help. 4. We have had the phone company out, the alarm company, and the old phone dealer out multiple time and everyone blames someone else's equipment. I don't care who's at fault, I just want to fix it. Its been happening over a year but it still bugs me. THe VOIP is a separate DSL modem with 3 phone lines on it. I can get more specifics if its important. My simplified uneducated thought was maybe the VOIP is sending the caller id or other info and its confusing the phone system until it has had a chance to process it. Or maybe the modem/phone box needs to have a setting tweeked. Any suggestions?