Wifi Phone with Video

Someone at the office here is asking about Wifi phones that can do video. The goal is to have our retail or warehouse facilities be able to call up management and use video to show what is going on.

Someone found a Skype phone that does this type of functionality. Since we already have an Asterisk box and about 100 phones, I would like to use Asterisk instead.

I was looking at phones like the Nokia E51. Has anyone else attempted to do this before? Any suggestions would be appreciated.