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Designing A Secure Future - FREE, Harbor Research white paper

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SIP: Step-by-step
One of the key enabling components of IMS is the open standard Session Initiation Protocol (SIP), which gives a scalable, extensible, and most importantly network independent method of establishing communication sessions between two or more end users. By stepping through a basic SIP call setup, the beneficial features of the protocol become clear. Figure 1 depicts the network architecture.
preview: http://www.motorola.com   date: 12/1/2005