We can't find our manual. We have a DECT 6.0, in the battery area it says DECT 1560. It is a single base and handset. Replaced the battery in April and as of 1 week ago (7/4/2011) the phone stopped ringing. We can call out and when we hear the other phone ringing, can answer the Uniden and all is okay. It just doesn't ring in. NOTE: If your e-mail address isn't in our contact list, AOL won't send your e-mail answer back to us.