Numerous outstanding lawsuits against Vonage could be very detrimental to the company's health. Looking into news about the new lawsuit by AT&T patent rights, they looks like another big problem for Vonage. While Vonage has been able to survive two large lawsuits in the past, this one may be a more significant problem. The patent in question is related to how calls are routed over data networks. Could this be an end to Vonage?