This has happened at least three times. The phone will ring (usually at night) but not a normal ring, like a quick ringing which repeats. When I pick up the phone, there is a dialtone. At first I thought it might be the cordless phones somehow picking up interference, so I unplugged them. The hardline did the same thing. So I had to leave the phone off of the hook for a long time before it would stop. This is driving me nuts, and woke me out of a deep sleep.
