I have some colleges at my place of business that are doing SIP over the Internet without encryption and I'd like to be able to show them how insecure this is.  I'd like to be able to provide them with some proof by sniffing their conversation and replaying it as a .wav file or something.  They are using Nortel clients.  I have been unable to find anything in the usual places like packet storm or Google.  Does anyone have any ideas where I could find something like this.  I've captured some packets in ethereal and it does decode lots of information but not exactly the shock value that I'm looking for.
 
Any help would be appreciated!
 
-Rich Compton

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