Hiroki Baba

Web-IMS Convergence Architecture and Prototype

To offer Web-IMS convergent services, network operators are providing interfaces for Web servers such as Parlay X on top of IMS application servers. However, this type of architecture leads to the building of at least as many interfaces as there are IMS services opened to the Web servers. This architechitecture also lacks consideration on media/transport processing. This paper presents a unique and generic service-independent functional entity on the IMS network border named Web Session Controller to handle interactions both at the signaling level and at the media/transport level to control Web-IMS communications. A prototype has been developed and is described that allows new types of services to be offered, e.g., push customized Web content to IMS users.

IMS presence authorization applied to Web applications using REST

Presence services are not widespread because there is little interest in a closed presence application in the IP multimedia subsystem/ next-generation network (IMS/NGN). A representational state transfer (REST) API for a presence service in IMS/NGN that can be easily used in a Web application has been proposed to encourage the use of presence services in IMS/NGN. Two problems with the conventional method for a presence REST API are presence authorization in Web applications and increased SIP processing within the IMS. This paper describes these problems in detail, proposes functions and analysis for solving them, and presents a prototype application.