Skype & IPS vendor claims

[Vladimir Parkhaev <vladimir () arobas net>]

Greetings,

Many IPS vendors are claiming that their devices can block Skype. 
Reading "An Analysis of the Skype Peer-to-Peer Internet Telephony Protocol" 
(http://www1.cs.columbia.edu/~library/TR-repository/reports/reports-2004/cucs-039-04.pdf),
paper I fail to see how those claims can be true. 


Has anyone looked into blocking Skype?


Thanks.

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