TITLE

IMS: Not Just For Mobile Nets

AUTHOR(S)
Passmore, David
PUB. DATE
April 2005
SOURCE
Business Communications Review;Apr2005, Vol. 35 Issue 4, p16
SOURCE TYPE
Trade Publication
DOC. TYPE
Article
ABSTRACT
This article presents information regarding IP Multimedia Systems (IMS). Loosely defined, the ITU's Next Generation Networks (NGN) is an attempt to re-invent the public Internet by adding a new signaling and control overlay infrastructure that mediates subscriber/user access to network resources. While based on IP, this network is intended to be the successor to the PSTN, and thus requires all legacy functions that traditional carriers rely on in any voice network, features like access control and authorization, call accounting and billing, lawful intercept and quality of service (QOS) for connections. Instead of using RADIUS for authentication, IMS uses Diameter, leveraging that standard's additional support for charging and billing functions such as pre-paid calling services. IMS also utilizes the COPS, Common Open Policy Services, protocol for mobile operators to enforce security and QOS policies across network elements. Finally. IMS initially mandated use of IPv6. However, this requirement was relaxed after it became obvious that most transport networks would continue to use IPv4.
ACCESSION #
16674759

 

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