I don't believe so. The phone and answering machine in this unit are combined so it probably wouldn't recognize a separate cordless phone. Sorry. The good news is that it is compatible with fiber optic phone lines, which my old answering machine wasn't.
Unfortunately this particular phone does not accommodate a cordless phone. It is however a great corded phone with answering machine, as long as large numbers do not bother you.
I use Basic Talk for landline phone service and it worked. However I had horrible clicking sounds on the speakerphone that were so annoying to me and the other parties that I had to stop using it. I have no idea if it's the phone or the phone service, or the two combined since the phone service is not AT&T, but my new phone works great so I suspect it's this phone. You might want to bear that in mind and keep looking.
No, there is no battery back-up. Must be plugged into electric wall outlet; this adapter is included. Ringer is loud set @ maximum (for a person w/normal hearing ability), with lowering ringer feature, and can be totally muted. Lots of flexibility with this phone.
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