[CAFE] using presence in CAFE

In my last blog entry I described the generic user procedures as used in CAFE. These procedures can be used for registration and various parts of presence. In this installment I will go a bit deeper into the presence related user procedures, showing how to publish presence information on behalf of a user and subscribe to presence information. And since presence information in CAFE is (currently) bound to the groups, I'll also show a bit of the group management. Basic presence concepts In brief; Presence gives information about the status of a user. This can be as simple as "I'm busy" or as complicated as "I have these and these services, I'm willing to chat, but not interested in phone calls,  I have these devices, I'm on holiday, I'm in a happy mood." etc. The presence documents describing the status are normally presented as a XML document in the PIDF format. When using CAFE you do not have to be able to create or parse such documents yourselves, as CAFE provides APIs for accessing the most commonly used elements in this document. For the set of elements we make accessible via the API we follow standards such as OMA SIMPLE and RCS. I'll try to briefly describe how presence works in an IMS network. Only the basics, as there is much more to it then I have space for here. Presence is done by a publish-subscribe model. presencesource aka publication A user ...

Date: April, 13 2010
Url: http://www.java.net/blog/erikvandervelden/archive/2010/04/12/cafe-using-presence-cafe

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