WebSphere brand IBM WebSphere Presence Server, Version 7.0

SIP external sources

IBM® WebSphere® Presence Server Component interacts with SIP external sources to provide enriched presence information for users.

Presence Server interacts with SIP external sources such as S-CSCF and external communities. By receiving data from these external sources, Presence Server offers access to a richer set of presence information. An example of such information would be data about a given user in other communities besides the community represented by this instance of Presence Server.

In one common scenario, Presence Server collects presence information from an external registrar, S-CSCF, and aggregates the information with the published presence data. As a result, you have access to more information about presentities and their availability. This is especially useful when you are monitoring simple client applications that register with the IMS network but do not publish presence documents.

Aggregating presence information from SIP external sources also enables you to collect information about the presence of an individual user in multiple external communities and include this information in the presence document for this user in the local community.

When you use SIP external sources to interact with an external community, individual subscribers receive data according to presence authorization rules. The authorization rules are not enforced, however, for data that Presence Server receives from the external community. This happens because subscriptions to the external sources are based on a "super user" identity rather than on the identity of the original subscriber. However, the authorization is performed locally on all the presence information for the user (including information from external sources and external communities)

The following illustration shows the way in which Presence Server takes presence information from two external sources, in this case S-CSCF and an external community, and aggregates the information into a single presence document.
Diagram showing presence data being aggregated

You can control the ways in which Presence Server interacts with SIP external sources. For details, see the topic Configuring for integration with external sources.




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