The responsibilities of a private-branch exchange (PBX) technician include the installation, programming, repair, and maintenance of voice and computing products, such as VoIP PBX systems, for a business. You configure the voice server, install and configure the correct VoIP software, and troubleshoot code as needed. You are also expected to troubleshoot hardware, software, and system problems using testing gear and other tools to ensure equipment is running correctly. You perform any modifications, moves, and adds requested by the client, and complete documentation such as updating and closing service tickets. Other duties include interacting with customers directly to resolve issues and advise on special requirements, upgrades, and needed maintenance. Some positions require offering support to data technicians.