IP Multimedia Subsystem

About: IP Multimedia Subsystem is a research topic. Over the lifetime, 4398 publications have been published within this topic receiving 43698 citations.

System and method of providing a user with a registration review in ims system

Abstract: Disclosed are a network-based device, method and computer-readable medium for operating an IP Multimedia Subsystem (IMS) to provide registration review. The method embodiment includes tracking and storing all current registrations for each user in an IMS system, receiving a request from a user for a status of the user's current registrations and presenting, in response to the request, the current status of current registrations for the user.

System and method of communication in an IP multimedia subsystem network

Abstract: A system and method of communication in an IMS network is disclosed. An apparatus that incorporates teachings of the present disclosure may include, for example, a call processing server having a controller element that receives from a terminal device a calling ID for establishing communications with a called party, submits to a telephone number mapping (ENUM) server a query corresponding to the calling ID, receives from the ENUM server a plurality of communication identifiers retrieved from a Naming Authority Pointer record according to a grade of service (GoS) of the called party, and selects according to the GoS of the called party a communication identifier from the plurality of communication identifiers to establish communications with the called party. Additional embodiments are disclosed.

Method and device for supporting voice service in wireless communication system

Abstract: An embodiment of the present invention relates to a method for supporting a voice service for a network terminal in a wireless communication system. The method includes transmitting an update location request (ULR) message to a home subscriber server (HSS) by a serving node, wherein if the serving node may not evaluate an IP multimedia subsystem (IMS) voice over PS session-supported indication value for the terminal, the ULR has no information on homogeneous support of IMS voice in a PS session.

Bridging the gap to IP telephony

Abstract: Application of the Internet protocol (IP) as a network technology for telephony has the power to revolutionize the telecommunications industry. The bandwidth is flexible and almost free, and new services can easily be introduced. This abundance of services and bandwidth is the promise of IP telephony. Before this promise can be fulfilled, however, IP telephony needs to mature and bridge the gap to current telephone systems: the public switched telephone network (PSTN), the integrated services digital network (ISDN), and the wireless systems. Transferring telephone service to the IP domain is not a simple task. Solutions used in switched telephone networks may not be appropriate for the data world. On the other hand, the data world creates its own problems - addressing, reliability, and security are some examples. Initially, these problems may seem best solved by reusing protocols and ideas from the switched telephone world and adapting them to IP. However, tomorrow's problems may be created by such solutions. For example, should an IP telephony service be encumbered with legacy issues such as in-band tone signaling? In this paper, we give an overview of interesting issues in this area and provide a framework in which solutions to small problems can contribute to reaching the final goal of an IP-based telephony service.