| 摘要 |
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.
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