Following on last year’s court victories against Vonage Holdings, Verizon Communications has filed suit against Cox Communications in the U.S. District Court for the Eastern District of Virginia on grounds that Cox infringed upon eight voice-over-Internet protocol (VoIP) patents held by Verizon. Cox, the third-largest cable system operator in the U.S., provides IP telephony service to more than 2.1 million customers. The eight patents cited in Verizon’s complaint include four that were named in the Vonage case. Last March, a federal jury determined that Vonage had willfully infringed two of those patents, which concern Verizon’s “enhanced Internet domain server” and Verizon’s “method, server and telecommunications system for name translation.” (Ultimately, Vonage settled the suit by submitting a $120 million payment to Verizon and by agreeing to pay Verizon a 5.5% royalty on its revenues.) Verizon has also asked for a jury trial, unspecified monetary damages and injunctive relief against future unauthorized use of its patents.