Telecommunications equipment manufacturer Estech Systems, Inc. has expanded its sole litigation campaign, begun this past April, with new suits suit against Burnco Rock Products (Burnco Texas) (2:20-cv-00275), Burrow Global (2:20-cv-00276), Hancock Whitney (Hancock Whitney Bank) (2:20-cv-00277), and U.S. Dermatology Medical Management (d/b/a U.S. Dermatology Partners) (2:20-cv-00278) in the Eastern District of Texas and against Energy Transfer (6:20-cv-00773), Gensler Architecture (M. Arthur Gensler Jr. & Associates) (6:20-cv-00774), Howard Midstream Energy Partners (6:20-cv-00777), HWC Wire & Cable (6:20-cv-00776), and SWBC Mortgage (6:20-cv-00778) in the Western District of Texas. Each defendant is accused of infringing various combinations of four Voice over Internet Protocol (VoIP) patents through their respective VoIP and voicemail systems.