Abstract: A presence aggregation system provides a presence aggregation server that allows for the publication of presence state of a publisher from the publisher's multiple endpoints. A presence state includes an availability value and an activity. An activity may include an activity token and/or a custom string. When any one of the publisher's endpoints makes a presence state publication on the presence aggregation server, the presence aggregation server generates an aggregated state of the publisher (i.e., the availability of the publisher aggregated across all of the publisher's endpoints) and publishes the generated aggregated state to each of the publisher's endpoints. The presence aggregation server may also provide the publisher's aggregated state to the subscribers of the publisher's aggregated state information.

Abstract: A presence aggregation system provides a presence aggregation server that allows for the defining and inclusion of custom presence states that are distinct from a set of default presence states that are provided by the presence aggregation system. When one or more custom presence states are defined and included in the presence aggregation system, a publisher at an endpoint is able to publish any of the defined custom presence states or default presence states as an indication of the publisher's presence. When a publication is made, the presence aggregation server may generate an aggregated availability of the publisher across all of the publisher's endpoints, and publish the aggregated availability to each of the publisher's endpoints. The presence aggregation server may also provide the publisher's aggregated availability to the subscribers of the publisher's availability information.