The Enterprise Voice, Video, and Messaging Endpoint must be configured to disable any auto answer features.

An Enterprise Voice, Video, and Messaging Endpoint set to automatically answer a call with audio or video capabilities enabled risks transmitting information not intended for the caller. In the event an Enterprise Voice, Video, and Messaging Endpoint automatically answered a call during a classified meeting or discussion, potentially sensitive or classified information could be transmitted. The auto-answer feature must not be activated by a user unless the feature is required to satisfy mission requirements.