Ethereal-users: [Ethereal-users] How to select the packets(messages) of a specific protocol?

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From: Abraham WEI <abraham.wei@xxxxxxxxx>
Date: Fri, 8 Apr 2005 14:06:13 +0800
I have learned some rules to  *deselect*  packets(messages) of certain
protocols. I have not seen any reference on how to *selecet* certain
protocols on the application layer, such as SIP. Does anyone know how
to capature packets(messages) of SIP(RFC 3261) only?
   Regards.
   Abe