Comment # 9
on bug 9021
from Hadriel Kaplan
(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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