This document describes a CMPE 208 Fall 2008 project on the Session Initiation Protocol (SIP) carried out by Chinmay Padhye, Amit More, Abhishek Sharma, and Nihar Dandekar. The project introduces SIP, describes its entities and functions, and outlines test cases the group planned to carry out including softphone registration, call setup, call forwarding, and call forking using softphones like Xlite and a Hamachi server.