On ething i foud with Polycomm, DON'T GO TO THiER DEMOS.
Make them demo onsite at YOUR office.
I had a demo at teh Polycomm ofice in Vancouver once, it was like watching live TV. I asked what bandwidth they had plugged in and they said BRI. well after looking at the router, I noticed 5 BRI lines !!
dropping it to a single BRI, which many ran phone networks on, made it aepar like a $25.00 web cam in a kiddie chat room.
Polycomm does have some decent voice recognition systems in their VC solutions but you REALLY have to consider bandwidth first and make sure it is equivalent to your own. they make a good camera with great depth and contrast to it, the mikes are excellent etc. But you need the pipe to get it streamig right.
also make sure the equipment on the other end is up to snuff too, or else your investment is wasted.
good luck,