This case is about NexStep's patent infringement lawsuit against Comcast. The court affirmed the lower court's judgment of non-infringement for two patents, one related to a "digital butler" and the other to a "concierge device." The court upheld the lower court's claim construction of "VoIP" and its judgment as a matter of law regarding the "concierge device" patent, finding NexStep's expert testimony insufficient. A concurring/dissenting opinion disagreed with the judgment as a matter of law, arguing that sufficient evidence supported the jury's finding of infringement under the doctrine of equivalents for the "concierge device" patent.