Core Services form the foundational layer of the Genesys Cloud CX platform. This group of microservices is responsible for managing the central, essential functions of the system. These include identity and authorization, organization and account configuration, user and group management (directory and membership), and the logic for interaction routing and agent assignment. Therefore, Core Services directly manage all the functions listed in the question, acting as the central brain for the platform's configuration and operational logic.

A. Public Interface Services: These services act as the API gateway, providing a public-facing entry point for applications to interact with the platform, but they do not manage the underlying business logic or configuration.

C. Communication Services: This layer is responsible for handling real-time media and signaling protocols like SIP and WebRTC. It manages the communication path but not the routing decisions or user configuration.

D. Application Services: These are higher-level applications, such as Workforce Management or Quality Management, that are built on top of and consume Core Services, rather than being the core itself.

1. Genesys Cloud CX Developer Center, Platform architecture overview: This document outlines the microservices architecture. It describes the "Core Services" layer as containing fundamental services like "Identity, Authorization, Organization, Routing, and Telephony configuration," which directly correspond to the functions mentioned in the question. The document distinguishes this from the "Public API" (Public Interface Services) and "Media Services" (Communication Services).

Reference: Genesys. (n.d.). Platform architecture overview. Genesys Cloud CX Developer Center. Retrieved from https://developer.genesys.cloud/platform/architecture/

2. Genesys Cloud CX Resource Center, About Genesys Cloud: This official documentation describes the platform as a set of microservices. The core functionalities like user management and routing are consistently presented as foundational services, separate from communication media handling or add-on applications.

Reference: Genesys. (n.d.). About Genesys Cloud. Genesys Cloud CX Resource Center. Retrieved from https://help.mypurecloud.com/articles/about-genesys-cloud/