Design and implementations series V: IMS applications and support [Series Editorial]

The IEEE Communications Magazine editorial team characterizes Series and Feature Topics as covering either vertical or horizontal topics. A topic is vertical if it is focused on a particular communication technology (e.g., next-generation optical switching). A topic is horizontal if it focuses on some operational aspect that is common across many communications technologies, such as interoperability testing or performance testing. The Design and Implementation (D&I) Series is horizontal, as D&I articles are intended to teach industry professionals about building next-generation communications products and services, regardless of the specific technology area.