Session initiation protocol sip is an applicationlayer signaling protocol for creating, modifying, and terminating sessions with one or more participants. Figure 1 shows a typical example of a sip message exchange between two users, alice and bob. The session initiation protocol is a requestresponse protocol, which means that all messages that are sent needs to be acknowledged, it can therefore run over udp user datagram protocol or tcp transmission control protocol. Usage of the session description protocol sdp alternative network address types anat semantics in the session initiation protocol sip 200506 6 pages. Understanding the session initiation protocol, third edition artech house telecommunications. Understanding the session initiation protocol 4th edition pdf now in its fourth edition, the groundbreaking artech house bestseller sip. Sip enables initiating, modifying and terminating sessions for a user, while.
Understanding the session initiation protocol offers you the most comprehensive and current understanding of this revolutionary protocol for call signaling and ip telephony. An endpoint can be a smartphone, a laptop, or any device that can. Session initiation protocol 2 sip overview given below are a few points to note about sip. Garg, yihchen wang, in the electrical engineering handbook, 2005. Your contribution will go a long way in helping us serve. Sip is a signalling protocol used to create, modify, and terminate a multimedia session over the internet protocol. Understanding the session initiation protocol, fourth edition, by alan b johnston. A session is nothing but a simple call between two endpoints. Heres what you need to know to protect your calls and your.
Session initiation protocol, sip, provides controlplane signaling for the ip networks. Session initiation protocol an overview sciencedirect. Understanding the session initiation protocol, fourth edition, by alan b johnston that you order. Understanding the session initiation protocol, fourth edition, by alan b johnston the. Session initiation protocol june 2002 the first example shows the basic functions of sip. Session initiation protocol sip is a must for voice over ip voip communication.