A Nortel PBX job involves managing, maintaining, and troubleshooting Nortel Private Branch Exchange (PBX) systems, which are used for enterprise telephony. Professionals in this role configure phone systems, handle software upgrades, and ensure seamless communication within an organization. They may also provide technical support, integrate VoIP solutions, and migrate legacy Nortel systems to modern platforms. Strong knowledge of Nortel hardware, telecommunications protocols, and networking is essential for this role.