A SIP Application Router for Presence-Driven Composition of IMS Services

Due to the current needs of the mobile telecommunications market to deliver tailored experiences to its users, IMS operators must be able to manage the interoperability and cooperation between the deployed services, in order to provide a high level of customization to their subscribers. With this goal in mind, this paper presents the Presence Application Router (Presence AR), based on the Default AR (DAR) concept introduced in the Java SIP Servlet API v1.1. The Presence AR allows runtime changes in the precedence relationships and application subscriptions that build the composition chains, based on the Presence information of the users involved in the session.