By Gonzalo Camarillo
If you want to grasp the IMS imaginative and prescient you want to learn this book.... The IMS (IP Multimedia Subsystem) is the interesting new expertise that would merge the web with the mobile global. it'll make net applied sciences reminiscent of the net, e-mail, immediate messaging, presence, and videoconferencing on hand approximately all over the place. The 3G IP Multimedia Subsystem (IMS) presents a radical evaluate of the IMS and its applied sciences. all through, the authors first describe how every one expertise works on the web after which clarify how a similar expertise is customized to paintings within the IMS, allowing readers to use any present and destiny net provider. provides an advent to the IMS - its objectives, historical past, imaginative and prescient, the enterprises inquisitive about its standardization and structure Discusses the signalling aircraft of the IMS together with protocols, reminiscent of SIP and Diameter, used among the IMS architectural entities. additionally describes how the IETF built those protocols and the way they're utilized in the IMS structure Describes the media airplane of the IMS and discusses net protocols that aren't presently utilized in the IMS yet might be sooner or later presents SIP-based carrier examples corresponding to presence, speedy messaging and Push-to-Talk Engineers, programmers, company managers, advertising representatives, and technically conscious clients will all locate this ebook beneficial because it may help them to appreciate how the IMS works and the enterprise version at the back of it.
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For instance, the IMS can be accessed using a WLAN (Wireless Local Access Networks), an ADSL (Asymmetric Digital Subscriber Line), an HFC (Hybrid Fiber Coax), or a Cable Modem. , Release 5). Future releases will study other accesses, such as WLAN. 3 Overview of Protocols Used in the IMS When the European Telecommunications Standard Institute (ETSI) developed the GSM standard, most of its protocols were specially designed for GSM (especially those dealing with the radio interface and with mobility management).
RELATION BETWEEN IMS AND NON-IMS SERVICES 9 Moreover, the same service could automatically set the user’s presence status to busy and divert incoming calls to an email address instead of to the typical voicemail. , changing the presence status of the user) without sending any data over the air to the terminal. Spare radio capacity can be used to provide a higher QoS to the existing users or to accommodate more users with the same QoS. Another important advantage of the IMS is that it does not depend on the circuitswitched domain.
The IMS defines the standard interfaces to be used by service developers. This way, operators can take advantage of a powerful multi-vendor service creation industry, avoiding sticking to a single vendor to obtain new services. Furthermore, the aim of the IMS is not only to provide new services but to provide all the services, current and future, that the Internet provides. In addition, users have to be able to execute all their services when roaming as well as from their home networks. To achieve these goals the IMS uses Internet technologies and Internet protocols.