7.2. SIP event package for conference state
Conference state notification is yet another event package (see Section 12.13.1) using the SIP events framework. The conference-state event package is used to learn about changes in the conference participants: in other words, a user can learn, through notifications, who has joined or left a conference. This event package also allows participants to learn the status of a user's participation in a conference and the sidebars in the conference.
Users can subscribe to a conference state by sending a SIP SUBSCRIBE request to the conference URI that identifies the focus. The focus acts as a notifier for this event package.
The name of this event package is "conference". This token appears in the Event header of the SUBSCRIBE request. The body of a notification carries the conference-state information document in the Multipurpose Internet Mail Extension (MIME) type "application/conference-info+xml" as defined in [Draft-ietf-sipping-conference-package].
Two pieces of information are provided about user status: the user's current level of participation in a conference (labelled activity-status) and the method by which the participant entered or left the conference (labelled history-status). The activity-status carries one of the following statuses: connected, disconnected or on-hold. The history-status carries one of the following statuses: dialled-in, dialled-out, departed, booted or failed.
Conference status information also carries information ...
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