Chapter 7. SIP Protocol Structure

In Chapter 4, we looked at the functionality that SIP (Session Initiation Protocol) provides from the end user’s point of view. In Chapter 6, we learned a bit more about the network perspective: SIP messages and how they are exchanged between the SIP entities. In this chapter, we take a closer look into the internals of the protocol itself, how its functionality is internally organized and achieved. From that perspective, we will see a model that splits the protocol functionality into several layers. The interest of this approach, apart from giving us a deeper insight into the way SIP works, lies in the fact that many SIP software implementations use a similar layered approach in order to implement the SIP functions. ...

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