From Jon Ringle:

From Jon Ringle:
 1) Added a setup_frame parameter to conversation_t
2) Used the conversation_t next to maintain a list of conversations with the
same src/dest tuple but different setup_frame number.
3) Changed the signature of find_conversation() and conversation_new() to pass
in the frame number.
4) Adjusted packet-sdp to select RTP conversation if both m=audio and m=image
are present, and T.38 conversation if only m=image is present. I expect that
RTP/T.38 dissecting to be better, but I don't have a way to generate T.38
packets.

git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@13244 f5534014-38df-0310-8fa8-9805f1628bb7