We have a Vtech 15250 dect cordless single unit telephone and we cannot receive incoming calls. I am not sure whether I have changed something while setting it up. We have only had this phone a short while and just got the phone line working after a verbal battle with Foxtel/Telstra. Initially we had no telephone signal at all but can now make outgoing calls. However, when attempting to call it we hear one ring then static. Any ideas? We also have internet service through this line, no problems there.