Research And Design Of SIP Protocol

Due to its tremendous advantage, IP telephony is becoming one of the most rapidly developing application technologies. Many organizations of telecommunication and computer in the world are engaging in research on this technology. This leads to two signaling standards of IP telephony, i.e., H.323 and SIP (Session Initial Protocol), which are recommended by ITU-T and IETF respectively.At present, H.323 has applied widely in the IP telephony in China. However, SIP is becoming a focus because of its merits such as simplicity, agility, distributing control and high expansibility, especially 3GPP uses SIP protocol as the main signaling control protocol in multimedia domain. Now application based on SIP is one of the hotspot in IP telephony.But SIP is new and immature, and not applied on a large scale in telecommunication field. Therefore, the research on IP telephony based on SIP is very significant.The main contributions of this thesis are as follows:1) Introduces the two current signaling standards of IP telephony and discusses the merits of SIP.2) Discusses the process of SIP message and then IP telephony system is designed.3) Implements an analog system of IP telephony based on SIP in the environment of local area network.4) The system is tested and the result is analyzed.The thesis is divided into five chapters. Chapter 1 introduces the current...