A developer specializes in creating, implementing, and maintaining communication software solutions using the system. They configure and customize the IP PBX system to meet business needs, integrating it with other software and hardware. They also troubleshoot and resolve issues, ensuring optimal system performance. Additionally, developers can train users, provide technical support, and ensure system security. They need strong knowledge of VoIP, SIP, and networking protocols, as well as programming languages like JavaScript or C#. They often work closely with other IT professionals, contributing to the overall digital communication strategy of an organization.