What is created on a conference server when a new conference is requested to be set up?

When a new conference is requested to be set up on a conference server, a "Focus" is created. In the context of conferencing, a Focus is a logical entity that manages the conference itself. It is responsible for coordinating the participants, managing the media streams, and handling the overall operation of the conference. The Focus acts as a central point for communication, ensuring that all aspects of the conference work seamlessly together.

Understanding this concept is crucial for grasping the functionality of conferencing within SIP (Session Initiation Protocol). While sessions, URIs, and events are all relevant in different contexts within SIP and the signaling involved in communications, they do not specifically represent the conference management entity that the Focus does. In essence, the Focus embodies the operational heartbeat of the conference, managing interactions and ensuring that the conference run smoothly for all participants.