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-# RTP - Real-time Transport Protocol - RFC 3550
-# Pattern attributes: ok overmatch undermatch fast fast
-# Protocol groups: streaming_video ietf_internet_standard
-# Wiki: http://www.protocolinfo.org/wiki/RTP
-# Copyright (C) 2008 Matthew Strait, Ethan Sommer; See ../LICENSE
-#
-# RTP headers are *very* short and compact. They have almost nothing in
-# them that can be matched by l7-filter. As RTP connections take place
-# between even numbered ports, you should probably check for that before
-# applying this pattern. If you want to match them along with their
-# associated SIP packets, you might try setting up some iptables rules
-# that watch for SIP packets and then also match any other UDP packets
-# that are going between the same two IP addresses.
-#
-# I think we can count on the first bit being 1 and the second bit being
-# 0 (meaning protocol version 2). The next two bits could go either way,
-# but in the example I've seen, they are zero, so I'll assume they are
-# usually zero. The next four bits are a count of "contributing source
-# identifiers". I'm not sure how big that could be, but in the example
-# I've seen, they're zero, so I'll assume they're usually zero. So that
-# gives us ^\x80. The next bit is a tossup. Next is the payload type, 7
-# bits. I've taken likely values from the WireShark code: 0-34, 96-127
-# (decimal). The rest of the header is random numbers (sequence number,
-# timestamp, synchronization source identifier), so that's no help at
-# all.
-
-rtp
-^\x80[\x01-"`-\x7f\x80-\xa2\xe0-\xff]?..........*\x80
-
-# Might also try this. It's a bit slower (one packet and not too much extra
-# regexec load) and a bit more accurate:
-#^\x80[\x01-"`-\x7f\x80-\xa2\xe0-\xff]?..........*\x80.*\x80
-
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