RPX completed a number of deals in March 2020 on behalf of its patent risk management network. The acquisitions occurred within the following market sectors: E-Commerce and Software; Mobile Communications and Devices; Networking; and Semiconductors.

In late September it was Cox Communications, and now in early December Centre One has filed suit against Charter Communications (8:19-cv-02317). The plaintiff asserts the same six patents, broadly directed to voice communications using an interface or gateway system between an IP network, such as a premise-based IP network, and a public switched telephone network (PSTN), with infringement allegations targeting voice over IP (VoIP) services that switch calls between PSTN and VoIP networks. AT&T is also in suit in this campaign, which began in 2008 but was revived in 2018.

Centre One has added a second case, this one against Cox Communications (8:19-cv-01832), to the litigation campaign that the plaintiff revived against AT&T in August 2018. The asserted patents belong to a family of seven generally related to voice communications using an interface or gateway system between an IP network, such as a premise-based IP network, and a public switched telephone network (PSTN). Centre One targets voice over IP (VoIP) services that switch calls between PSTN and VoIP networks in this campaign, which began in December 2008 in a case filed against Deltathree, Vonage, and Verizon.