IP Phone bandwidth utilization

During the course of of typical conversation,
how much bandwidth does one IP Phone need/utilize?
No music-on-hold, no voicemail, etc.
Just plain voice talk.

I am looking for estimates for a single IP Phone.
Like X Mbps or Y Kbps

the wiki is your friend : voip-info.org/wiki/view/Band … onsumption

ulaw is 64 kbps each call leg, plus overhead - figure 160 kbps per call total.

baconbutties link has alot more information, including a link to a bandwidth calculator on Asteriskguru.com.