I had the same problem. There is a button on the base that says do not disturb. If there is a musical note whith a line through it on your handset, hit the do not disturbe button on the base and it'll work fine.
morris, February 2009
The manual says you have the Do not disturb (DND) on...
While you are in standby, press the DND button (to switch on or off)....
Seems simple but....that is all I could find...
