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IMS Presence Resource List Subscription and Notification

IP Multimedia Subsystem (IMS) provides a framework and building blocks for building advanced telecom services. One such service is network wide publication and subscription of presence information. Users can subscribe to presence information for their contacts. If the contact accepts their request, the subscriber will be registered for presence notification. Whenever the friend publishes presence information, the IMS presence framework will notify the subscribed users.

IMS presence information communication can put a lot of load on the network. One way to reduce this load is to predefine the list of friends and family. When you subscribe to the "friends and family" list, a Resource List Server (RLS) in the IMS subscribes to the individual subscribers (presentities) on your behalf. Once the RLS completes the registrations, it collates the individual presence status into a single NOTIFY message.

IMS Presence Resource List Subscription and Notification Flow pdf                                
IMS Presence (Resource List) Poster  (11x17) pdf

The diagrams in this page were generated with EventStudio System Designer 4.0.
The source files for the diagrams can be downloaded from: ims-presence-resource-list.zip

The call flow is explained below by focusing on a different aspects of IMS presence publication and notification framework.

Overview

The following diagram provides an overview of the message interactions. Interaction details and remarks are omitted from the diagram.

IMS Presence (Resource List) Overview pdf
IMS Presence (Resource List) Context Diagram pdf               

High Level Summary

The following flow diagram diagrams look at the presence subscription and notification at a high level.

IMS Presence (Resource List) Network High Level View pdf
IMS Presence (Resource List) Network Level View pdf

Watcher S-CSCF and Resource List Server Role

Watcher S-CSCF and Resource List Server Interface Sequence Diagram pdf
Watcher S-CSCF and Resource List Server Interface Context Diagram pdf

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