Hi All,
I'm a Ph.D. student and I'm now doing research on SIP security.
I haven't found that much about SIP security research on the web. I'd like to find some kind of "state of the art" document about SIP security (list of known issues, unsolved problems... etc).
Do you know any definitive on-line sources for this subject?
Thankyou very much for any advice you can give me. Dario