By Mark Wuthnow
This ebook is a must-have for an individual in need of sturdy info on IMS. this can be the very best IMS reference fabrics with purely round three hundred pages. you cannot beat the worth this ebook deals.
The authors do a major activity in explaining IMS to readers. I loved the format of this publication for the "modular layout" it contained inside its periods. the 1st consultation of this publication is devoted to high-level structure and the rules of IMS. you could comprehend the values of IMS reminiscent of consultation keep an eye on, carrier mixing, QoS, versatile charging and the evolution with key components on top of things, bearer, and alertness planes. after you have a great take hold of from consultation 1, consultation 2 extra breaks down a number of essences of IMS into parts. this is often very worthy in getting the history info equivalent to SIP, SDP, MSRP, XML, and Diameter for development IMS serving particular types of reasons.
Session three are devoted to the `enablers' of IMS OMA. those chapters comprise info on those OMA enablers' layout reasons, positive aspects, values supplied to subscribers and the way to enforce them. The e-book is written in a simple to persist with format.
Session four is finest consultation through interpreting a number of vignettes to get into the contexts of IMS in actual international implementations. The IMS provider supply framework are laid out for high-level viewing on what and the way IMS new providers are designed, brought and maintained. The authors did a wonderful task on those real-world situations to aid readers totally know how IMS pertains to everyone's lifestyles.
I think that any one studying this publication will enjoy the details provided, regardless of how the intensity the readers count on on IMS genuine global implementations. The publication is helping in those parts and extra. the true bonus of this booklet is written by way of 3 specialists from AT&T. it truly is through some distance the simplest IMS e-book i've got ever learn. seize it and skim a number of pages, you'll find how necessary this e-book is.
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Extra resources for IMS: A New Model for Blending Applications (Informa Telecoms & Media)
Getting a presence status). Then, one will need to identify the QoS associated with the session. Both of these actions will generate a call detail record (CDR) with appropriate information. Finally, there must be a mechanism to identify the application server or servers along with the specific application or applications being invoked. These applications can be either within or external to the operator’s network. For third-party applications, most operators will place a control gateway between their network and the third party.
This control gateway in the IMS architecture is referred to as an open service access (OSA) or Parlay. In most instances, the charging record for the third-party application would be done here at the OSA Gateway. The OSA Gateway will be further described in Chapter 6. Of course, all of the proceeding must also work for the network operator’s customers roaming into a visited market. Globally unique identifiers are exchanged between network operators and between a network operator and a third-party provider to identify the home and visited networks.
Service broker The iFC is a set of prioritized trigger points assigned to a subscriber’s profile that indicate the order in which multiple application servers (ASs) should be invoked, depending on what services a user has subscribed to. This will cause a set of multiple ASs to be invoked in a prioritized order at the same trigger point. 5). In a pre-IMS scenario, the only way for these two services to be combined together would be for them to be developed together as a single package. This in turn limits the service provider’s change-out options if one of the services is not performing properly or if one of the services scales disproportionately compared to the other.