The least privileged role that satisfies both capabilities is Supervisor. The user must participate in telephone campaigns and must also speak to an agent without the customer hearing, which is supervisor whisper coaching. Standard and Premium Agent roles can handle assigned interactions based on license capabilities, but they do not provide supervisory monitoring, whisper coaching, barge-in, or team oversight controls. An Administrator role would provide much broader configuration authority than needed, violating the least-privilege requirement. Cisco's Contact Center licensing and role model separates agent capabilities from supervisor capabilities; Premium Agent adds additional digital and reporting capabilities, while Supervisor adds monitoring and assistance functions. Whisper coaching is specifically a supervisor call-monitoring function, not a standard agent function. Because the scenario does not require tenant configuration, user provisioning, routing setup, or recording policy administration, Administrator is excessive. Supervisor is the minimal role that gives the monitoring feature while also supporting campaign participation. Reference: Cisco Help, Manage access in Webex Contact Center; Webex Contact Center Data Sheet.