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12.4(9)T - Zone-based firewall. The role of NBAR?

I'd like to know the role of NBAR in the new IOS Zone-based Policy Firewall. Is it used to only identify P2P traffic or IM/other traffic also? Did anybody try it? What should be specified in the "match file-transfer" command - true regex or NBAR file-name-based expression?

Thx.

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