Jonathan,
Thanks for your response - it confirms what I had suspected.
Quick follow-up on the RTCP below.
> >
> > As an aside, should RTCP reports be sent to the address received as
> > source address in incoming RTP packets, or should they be
> sent to the
> > same address as outgoing RTP packets ? If the latter (and
> the addresses
> > are different),
>
> Unless signaled explicitly with the sdp4nat extension, RTCP
> is sent to
> the same address as RTP, but on a port higher.
>
> why is the media sink device of my correspondant
> > interested in RTCP reports for packets generated by the media source
> > device, which has a separate network interface ?
>
> Why would RTP and RTCP be on different network interfaces??
Suppose I am corresponding with someone whose microphone and speakers are separate devices, with their own IP addresses (=> network interfaces).
I receive RTP packets from the microphone, and send RTP packets to the speakers. I guess I was thinking of RTCP Receiver Report information, which contains information about the packets I have received from the microphone device. Obviously, the microphone device is most interested in these, but I will send them to the speakers (same place as RTP packets).
I suppose I will actually send a Sender Report, continaing count of RTP packets I have sent, so this will be of interest to the speakers as well. So the microphone & speakers will have to communicate between themselves anyway, whichever one got the RTCP.
...Mark