I have tried both suggestions for me to view the RTP/SIP/SDP traffic contained 
in the UDP packets travelling through an OpenVPN tunnel.  Neither worked for 
this reason: The payload of the UDP packets do indeed contain such traffic as 
RTP SIP etc as appropriate, but they are all preceeded by a tunneling protocol. 
 In my case it appears to be PPP.  I can not use "Decode as" because in the 
transport options PPP is not listed.  This is unfortunate because obviously 
there are dissectors or plugins in the Wireshark software that will do the 
trick but I don't seem to have them available to dissect the protocol when it 
is in the payload instead of the link layer.   I am trying to confirm that the 
protocol is indeed PPP.  In the mean time is there anyway to add more options 
to the decode as within the transport layer?

Bill

 
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