I have to phone home and chat to my mother. I rang at 12.10 pm but I got a line busy tone. I rang again at 12.30 and the same thing again. I rang again just there at 12.50 and the same thing has happened again. More of the same - line busy. Its not a house phone. It's a mobile home so the phone is not off the hook. She doesn't usually make calls and whenever she makes a call its not usually very long. I think it's weird how the line is busy since I tried to get through to her about 40 minutes ago. That's absolutely unusual. 15/20/25/30 minutes might be the duration of her calls.