Coming back refreshed from holiday, I was interested to read this piece in New Scientist by Barry Fox. Infineon (the Siemens semiconductor company who make some of the chips used in Diva Server) have patented a method of mangling VoIP. The principle is to disrupt the timely delivery of VoIP packets, and therefore make it unusable for voice, although non-voice streams would be ok. The patent doesn't talk about applications, but of course it could be used by telcos to disrupt services trying to get toll bypass by using VoIP. Some of these technologies are already in use, for example there was some press this ast year about companies Narus and Verso that sell VoIP/Skype blocking software to Chinese telcos.