Maybe- why not a Dock-n-Talk?  http://www.dockntalk.com .

It connects to your phone and plugs intoa phone jack and makes your regular
home telephone(s) ring and act as "extensions" through your cellphone.

I realize this isn't exactly what you asked for, but I've never seen what
you're asking for, and if such a device existed, you'd need a bunch of them
to cover multiple rooms, and still have to run for the cellphone (wherever
you left it.)  A Dock-n-Talk would just allow you to pick up the nearest
phone and answer.

Pen <Only.Pen@gmail.com> wrote in news:f3af5782-bbe5-4e25-8c9a-
78ec047dc99d@l32g2000hsh.googlegroups.com:

Easy - Wireless Intercom from Radio Shack.

Put the phone down next to one unit locked in transmit.

Put other units, as many as you wish, as receivers around the house.

Any unit could be the "master" to set the phone down next to.  All others
would simply be broadcasting whatever crazy noises the phone made.

If you live in a house of pandemonium with screaming adults or kids,
cover the phone/master station with a towel or put them in a drawer.

A baby monitor will also work.  Put the baby tranmitter next to the
phone, put the Mom units all over the house.  These will be way too
sensitive for the house of pandemonium as they have very sensitive
microphones.  I got a pair from a thrift shop for $2.  One transmits
continuously hidden away where the cars are parked in the driveway.  The
receiver is by my bed so I can suprise the little bastards going for the
gold with the .357 Magnum's roar...(c;

Larry