Wireshark-bugs: [Wireshark-bugs] [Bug 9021] RTP not decoded inside the conversation in v.1.10.1
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 06 Mar 2014 08:32:49 +0000

Comment # 9 on bug 9021 from 
(In reply to comment #8)
> If RTP is sent before the answer to the offer isn't that technically a bug
> in the application? If there is early media the answer SDP should be in an
> 1xx response shouldn't it?

Nope, it's perfectly legal, and in fact quite common.


> In a traffic generator I have used RTP before "SDP answer" would cause ICMP
> as the ports to receive media will not be open.

Then the traffic generator was in violation of the RFCs technically - RFC 3264
if I recall correctly.  The minute you send the SDP offer you're supposed to
start accepting/listening on the port(s) you advertised in it.  Having said
that, it's not unheard of for devices to wait for an SDP answer in a 18x or 200
before they actually play/render/transcode/whatever the media - especially PSTN
gateways for example - but usually in such cases they just drop the RTP packets
without sending back ICMP unreachable.

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