My Nt8B27AABB is stuck after a failed transfer. All the lines in the house show: in Use: John. If you go to Johns extension you cannot pickup that call and shows that line as line in use. If someone calls my house they get a busy signal. How can "disconnect" this call.? This happened after I called my house. It was picked up in Johns extension and was transfered to the kitchen. Since nobody picked up, I hung up. And that was it. Please help!