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Building Telephony Systems with OpenSIPS - Second Edition by Bogdan-Andrei Iancu, Flavio E. Goncalves

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Chapter 1. Introduction to SIP

Before we dive into OpenSIPS, it is very important to understand some important concepts related to Session Initiation Protocol (SIP). In this chapter, we will cover a brief tutorial regarding the concepts used later in this book. By the end of this chapter, we will have covered the following topics:

  • Understanding the basics of SIP and its usage
  • Describing the SIP architecture
  • Explaining the meaning of its components
  • Understanding and comparing main SIP messages
  • Interpreting the header fields' processing for the INVITE and REGISTER messages
  • Learning how SIP handles identity and privacy
  • Covering the Session Description Protocol and Real-Time Protocol briefly

SIP was standardized by Internet Engineering Task Force (IETF)

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