Ethereal-dev: [Ethereal-dev] SIP identification???

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From: "Mike Kennedy" <Mike.Kennedy@xxxxxxxxxxxxxxx>
Date: Fri, 27 Jan 2006 12:14:44 -0000
Hi all,
 
How does ethereal work out that the packet is a SIP protocol packet??  There does not seem to be any protocol flag?
 
Cheers
Mike

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