Estech Systems IP LLC, a subsidiary of Estech Systems, Inc. (Estech), has revived the litigation campaign that Estech launched in April 2020, suing 99 Cent Only Stores, Abbott Laboratories, BMW, Carvana, Charles Schwab, Conduent, Extra Space, First American Financial (Republic Title of Texas), Fiserv, Liberty Mutual, Marriott, McKesson, Petco, Public Storage, Primoris Services, Randstad, SoFi, and Toyota in separate Eastern District of Texas suits. The asserted patents are broadly directed to various aspects of Voice over IP (VoIP) technology (e.g., Caller ID, call quality monitoring, voicemail systems, and phone directories), with the defendants accused of infringement through the provision or use of VoIP products.