Despite it being Microsoft, I've found it to be the most reliable and seamless system for multi-party Audio, Video, and Screen-sharing based meetings - and I've used at some time or another in my career almost all the other big hitters in the corporate virtual-conferencing space.
Combine Lync/SfB with one of those nice multi-camera units[1] that sit in the middle of the meeting table and provide audio tracking of the speaker (the active camera switches to the person speaking) along with always-on 360 degree video as well - and it's the closest you can get to being there.
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[1] http://www.polycom.co.uk/products-services/products-for-micr...