VoIP Server Impersonation Issues

A friend and colleague of mine Sandro Gauci has just posted some interesting information on the blog for his SIP VoIP auditing tool suite Sipvicious:

http://sipvicious.org/blog/2007/10/server-impersonation-and-sip.html

While you there if you haven't given Sipvicious a look to assist you in your SIP VoIP auditing I urge you to do so.

EDIT:

You can also read more about the issue here.