[AVT] draft-ietf-avt-rtp-clearmode-02.txt review

Hi everyone,

	Quick review of draft-ietf-avt-rtp-clearmode-02.txt:

  [1] There's an ID-nits issue on line length, according to "wc -L" the
  longest line is 90 characters over the 72-char limit (according to
  http://www.ietf.org/ID-nits.html)

  [2] Abstract formatting problem, the final line needs to be placed
  in the appropriate place.

  [3] In Section 5 final paragraph, the a=fmtp is discussed, yet 
  Clearmode has no defined fmtp parameters ... seems like there
  was a typo here (maybe "rtpmap" was meant instead of "fmtp"?).

	Finally, one potential security issue, I'm not a telephony guy
but ... are there any sort of in-band signalling security issues here?
I.e. if the stream is unauthenticated, could someone craft a single
RTP packet with a plausible timestamp and sequence number, inject it
into a Clearmode stream, and get network switching gear to do
something "interesting" for an attacker or for someone looking for
free phone calls?

	If so, one wonders if the "MAY" in the security considerations
for authentication is appropriate ... but as I said, I'm not a
telephony guy, and I've probably heard too many Captain Crunch
<http://www.wikipedia.org/wiki/Captain_Crunch> stories :-).

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John Lazzaro -- Research Specialist -- CS Division -- EECS -- UC Berkeley
lazzaro [at] cs [dot] berkeley [dot] edu     www.cs.berkeley.edu/~lazzaro
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