Hi there - As I mentioned earlier, here I would like to take chance in introducing SIP - a signaling protocol widely used in the current Telecommunications world. SIP is a well known signaling protocol for controlling multimedia sessions such as voice/video calls over Internet Protocol (IP) networks. SIP - SIP stands for S ession I nitiation P rotocol - It is a very lite signaling communications protocol used for establishing sessions in an IP network. A session could be referred as a simple two-way voice call (or) a collaborative conference multimedia call. - Simply, SIP is a mechanism to establish, modify and tear down the multimedia sessions. - SIP is a protocol which resembles HTTP ( H yper T ext T ransfer P rotocol) - The reason it became very famous because of its simplicity to program, troubleshoot and integrate. Moreover, it is a open source and referred to RFC 3261. Brief history of SIP - SIP was originally designed by Henning Schulzrinne ...