Design Considerations on Subscription and Notification Function in the Presence Services for Hierarchical ResourceList

Presence service is emerged to meet the needs of integrated service and presence service will be a core function within integrated services. IETF SIMPLE WG generates standard SIP extensions for presence service. In this paper, we described the presence service model using resource list server. We define the components to support the subscription and notification function in the presence service for hierarchical resource list. And we will describe the check points among components for interoperability reflected on the system development experience and participation experience of international interoperability test event.