Vonage is once again in the legal hot seat, having been <A HREF="http://news.zdnet.com/2100-1035_22-6092374.html?tag=zdnn.alert">sued by yet another company</A> for allegedly infringing on patents. Patent-holding company Klausner Technologies said Monday it filed suit against Vonage in federal court in the eastern district of Texas. Klausner claims that Vonage, which sells Internet voice calling service, is infringing on patents being used as part of its voice mail service. Klausner is seeking damages and royalties worth about $180 million.