Estech Systems IP LLC has followed up its separate December 2023 complaints against 3CX, HP (Plantronics, Polycom), NEC, and Yealink Network Technology with new ones filed separately against 8x8 (3:24-cv-02522), Dialpad (3:24-cv-02524), Freshworks (3:24-cv-02525), Intermedia.net (3:24-cv-02526), Ooma (3:24-cv-02527), Sangoma Technologies (2:24-cv-00285), Zoom Video Communications (3:24-cv-02528), and Zultys (3:24-cv-02529). The asserted patents are broadly directed to various aspects of Voice over IP (VoIP) technology, such as caller ID, call quality monitoring, voicemail systems, and phone directories.