Twin-set of mains rechargeable mobile house phones (may need new batteries, as sat around for a year). The "master" base unit includes an answerphone system.
Can answer calls on either phone, as both will ring.
They can also be used as an internal intercom connection between both phones
Twin-set of Panasonic house phones (Sele Farm SG14)
This offer has been gifted to someone and is no longer available.