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    Chapter 17. Call Control

    Since the inception of the core SIP, numerous SIP extensions have been defined that provide new tools and capabilities to manipulate SIP calls and dialogs. The combination of these tools allows us to build many SIP-based services. In this chapter, we will look at some of these extensions. We start by explaining what we mean by “call control” in the remit of SIP, and then we will see different approaches to implement call control and the tools that are available.


      

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