I had the opportunity to take an in-depth look at Avistar's C3 family of videoconferencing products and came to the conclusion that some technologies just don't belong in the cloud. Avistar's products use the good, old-fashioned, reliable client server model to bring videoconferencing that actually works to the corporate desktop, all without the mention of a cloud-private, local or otherwise.
After exploring the intricacies of the product, the bandwidth requirements and the benefits of a 'behind the firewall installation,' it became obvious that certain services have no business being placed out in the ether, especially high-performance videoconferencing.
That said, my stance on "non-cloudified" products may not last long. With a touch of virtualization, a browser-based client and a bit of massaging, Avistar C3 could probably effectively work as a cloud service. It will simply become a matter of bandwidth and latency to overcome any issues-and a growing WAN acceleration market provides the answers to those issues.
If you are interested in what Avistar is all about, read my full review here.