International Journal of Computer Networks and Wireless Communications (IJCNWC)
The Session Initiation Protocol (SIP) is an application level signaling protocol used for locating end users, establishing, modifying and closing multimedia sessions between end users. This protocol has been adopted by 3GPP as a signaling protocol for IP-Multimedia Subsystem (IMS) networks. The usage of IP telephony is increasing rapidly, which indeed increases the load on the SIP servers. This paper gives an overview about different load controlling techniques applied on SIP servers to increase the through put and analyses the corresponding results of those works.