The telecommunications industry has witnessed a remarkable transformation over the past few decades, with the advent of advanced technologies and the growing demand for seamless connectivity. At the heart of this evolution lies the development of Online Charging Systems (OCS), which have revolutionized the way telecom operators manage and monetize their services. In this comprehensive blog post, we will delve into the history and progression of OCS, exploring its impact on the telecom landscape and the key milestones that have shaped its journey.