Which feature allows managers to monitor live calls in real-time within Service Cloud Voice?

The feature that enables managers to monitor live calls in real-time within Service Cloud Voice is supervisory monitoring capabilities. This feature allows managers to listen in on calls as they happen, which helps in ensuring quality assurance, providing immediate support to agents if needed, and training opportunities on-the-fly. Supervisory monitoring creates an environment where managers can aid agents during calls without interrupting the conversation, thus enhancing both the customer experience and agent performance.

Other features like call transcription services are valuable for reviewing conversations after they occur, while performance analytics focuses on metrics and insights after calls are completed. Automated call distribution plays a crucial role in managing call flow to the right agents but does not provide real-time oversight of conversations. The primary emphasis of supervisory monitoring is live observation, making it the correct choice for this scenario.