iPhone/Mac Desk Customization help

Hi guys,
i got an iPhone 4 and Mac Pro. Both of which are usually within a meter of each other while i'm home.
I was wondering if i got an iPhone dock, plugged it into the Mac Pro, whether there would be any way of making a 'incoming phone call' to be heard over the Mac Pro cinema display.

Like the initial ringtone and then also the voice call be relayed into the LED Cinema Speakers.

There is practical reasons for this, apart from the obvious not needing to hold the phone next to my head/putting headphones on. But also, the iPhones speakers arent as loud as the cinema display, thus it would be easier to hear the phone call when im watching tv in the other room or something similar.

Thanks a lot, and looking forward to your replies!