Whe I check my voice mail messages from a phone dialing extension 999 the prompts are not very consistent. In other words the voice mail attendant is not telling me what to do next. It will start out ok and I will press star to start the message play back and it will play the first message, then it gives me silence or plays the next unheard message if it exists. Once all of the new messages are played back I try to delete the messages and it does work sometimes but I get silence after that. I checked the directory on the server and the messages are still there and the call assistant shows I have read messages in my box but I have not found a way to delete these from the phone. Is there a button to listen to old messages and delete them?