This class represents the state presence category and denotes the availability of a presentity.
Assembly: Microsoft.Rtc.Collaboration (in Microsoft.Rtc.Collaboration.dll)
UserEndpoints are strongly advised to use the BeginPublishPresence(ICollection<PresenceCategory>, AsyncCallback, Object) API so that the instance is published in appropriate containers that allow the aggregation script to react accordingly.
Application endpoints usually prefer to skip any aggregation logic and publish their aggregate state directly since they don't do any watcher management.
When subscribing to remote presentities, this category is automated requested for.