Hear ring through speakers in docking station?

Hi All. Love my iphone but don't like to carry it with me in the house. I miss calls because the phone's in another room and I don't hear the ring. If the phone's in a docking station with speakers, is it just the ipod functionality that gets piped through the speakers or the phone's ringer too? Can you put the phone on 'speaker phone' and send and receive calls while its in the docking station?

Is there another way to boost the volume of the ringer?

Thx.