3:40 PM -- Shares of Radvision Ltd. (Nasdaq: RVSN) are down $2.89 (32%) at $5.97 today, because the company's biggest customer, Cisco Systems Inc. (Nasdaq: CSCO), is buying rival Tandberg ASA (OSE: TAA).

I'm sure Radvision officials have been bombarded with questions about what they're going to do. In response, they've put out a statement saying they don't yet know what they're going to do. Hey, at least they're being honest.

The statement does note that the news was "unexpected," but beyond that, it just says Radvision is "assessing the effect" of the deal.

Radvision also notes that it's spent two years on strategizing ways to broaden its customer base. Now might be a good time to implement some of that strategy.

Cisco, for its part, either dodged or misunderstood a question about Radvision on this morning's conference call. Officials answered it by talking about how Tandberg's partners don't overlap much with Cisco's. I'm sure Radvision investors are thrilled.

— Craig Matsumoto, West Coast Editor, Light Reading