SPIT?
Written on the original Movable Type site and recovered from the Internet Archive.
Think VOIP is safe? Wait till you get SPIT. Spam over Internet Telephony. Spam, DoS Headed VoIP’s Way. And with VOIP you are also vulnerable to DoS attacks. You really want your phone system vulnerable? I am going to only have VOIP in my new house. I will tell you how it goes.