Indeed, a Silver Lake-Tandberg deal -- assuming Avaya played into the scenario -- would really set Avaya apart and would arguably make Avaya the most credible alternative to Cisco for enterprise communications. It's getting harder and harder to escape the conclusion that video is moving from nice-to-have/status symbol, to critical element of a communications solution going forward (Irwin Lazar thinks so). Of course, video means lots of different things: Desktop, room, telepresence. All but desktop seem like a pretty good bet to take off for business purposes (also see this Wainhouse Research feature article.
But if there's another big winner in this scenario besides Avaya, I'd have to say that, in fact, it's Cisco, on both the perception and the reality. In terms of perception, an Avaya-Tandberg mashup essentially validates Cisco's big push into telepresence. I was among those who were very skeptical about telepresence; it just seemed too expensive and, frankly, over the top -- with the lighting and the color design and the C-shaped table and all. But what the ensuing two years have taught us is that the telepresence room may well be the Apple interface writ large: It's just cool, and it makes people go, "Ooooh" and "Aaaah." Technologists discount this factor at their peril.
And, of course, Cisco wins big on the substance if video/telepresence rooms become a standard feature of corporate offices, because that's gonna take a *lot* of bandwidth. In fact, that was one of the reasons I was skeptical of telepresence when Cisco first came out with it: It seemed like just too naked a ploy, too obvious an attempt to get people to upgrade their routers yet again. But damned if it didn't work. Cisco just keeps figuring out ways for its competitors to sell more bandwidth and QOS for Cisco to provision.
A final aspect to watch is the competition/cooperation/partnership view of things. Cisco looms as the only real end-to-end choice, the one-stop shop. Microsoft could be this at the application layer, but you'll always have Cisco in the network, where Microsoft is absent. The contrasting vision is, if not best-of-breed, at least multivendor. With the Siemens-Enterasys JV, there's clearly an attempt to leverage new accounts for both vendors, at the same time that there's a realization that Enterasys still needs customers beyond Siemens users, and Siemens users will have vendors besides Enterasys in their IP infrastructures.
Some enterprises may be truly all-Cisco shops, but going forward it's likely that many will remain multivendor, whether intentionally or by circumstance (M&As, installed base not going away, etc.). Which raises a point about telepresence: If it does become business-critical, or at least something that every business has, there will be intense pressure on the vendors to make their systems interoperate, which they don't today. Cisco may not be thrilled by that, but it will be driven by its own success.