How much network overhead does Zebedee add?

Dear group,
 
How much overhead is added by Zebedee for security to each data packet? More specifically, since I am using it
for VoIP, how much additional overhead is added to each UDP segment? If this is unknown, what would be the best way to determine it? Since it uses a TCP tunnel, it seems to be a bit more tricky determinging the overhead using Ethereal.  
 
Thank you greatly.
I look forward to your replies. 
 
Sincerely,
Rutger T.
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