I used the following video tutorial and found it very easy to set up. I don't need to press 1 to answer a call - I just hit the phone icon and it answers. No rtcom app needed either. Just Gizmo and Grancentral:

http://video.google.com/videoplay?do...arch&plindex=5

I have some invites available as well: PM me with your email address and I'll hook you up.