Which of the following is a feature of Avaya Aura's Communication Manager?

Avaya Aura's Communication Manager is designed to enhance communication by integrating various functionalities, one of which is the support for Voicemail to Email. This feature allows users to receive voicemail messages directly in their email inboxes, streamlining the process of managing messages and improving productivity. By integrating voicemail with email, users can listen to their messages from anywhere without needing to access their phone system directly, thus enhancing flexibility and efficiency in communication.

The other features listed, while they may be part of the broader capabilities of the Avaya system or other components, do not specifically characterize the unique offerings of Communication Manager. Avaya Aura as a whole supports various conferencing features, has high user capacities, and can provide call center functionalities, but these elements are implemented across different interconnected services rather than being intrinsic features of just Communication Manager alone.