Hi
i am also working on SIP i started my internship and i got this as an assignment on SIP i have to implement a light weight SIP protocol for IP phones .i am still unable to understand the code although got some knowledge of the SIP structure and how is works but still needs help in making my route.
The code in C for SIP protocol is available on www.gnu.org .if u r working on it or started work on it plz be in contact.
alex007