37 Installation, maintenance, upgrade, and repair of communications systems; Specifically communications processors, interfaces, multiplexers, voice switches, local network switches, wide area network switches, voice mail systems, messaging systems, and telephone instruments; Installation, maintenance, and repair of associated computers and computer software; Installation, maintenance, upgrade, and repair of communications network infrastructure; Specifically copper cables, optical cables, cable terminations, and radio links; This infrastructure is used for telephone lines, structured wiring, and wireless network installations inside, outside, and between buildings