Wireshark-bugs: [Wireshark-bugs] [Bug 2992] Media stream incorrectly decoded as SRTP instead of
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 23 Oct 2008 16:12:50 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=2992





--- Comment #4 from Christian Garbin <christian.garbin@xxxxxxxxxxx>  2008-10-23 16:12:49 PDT ---
(In reply to comment #3)
> The SDP dissector sets up conversations even if later in the negotiations some
> of the options are dropped. In this case SRTP is proposed, but later rejected
> by setting the port to 0. That isn't handled as indication to drop a proposal.

Jaap,

It seems that the dissectors needs to be upgraded to conform to RFC 3264,
chapter 6:

   An offered stream MAY be rejected in the answer, for any reason.  If
   a stream is rejected, the offerer and answerer MUST NOT generate
   media (or RTCP packets) for that stream.  To reject an offered
   stream, the port number in the corresponding stream in the answer
   MUST be set to zero.

In this case the answer has the SRTP m line port set to zero.

Christian


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