Re: [AVT] draft-ietf-avt-rtcp-bw-05.txt question

[Stephen Casner <casner@acm.org>]

Aaron,

> In the case where b=RR is specified that would mean that no sender reports
> or BYE packets could be sent. Is that allowed? In the A/V case the client
> would not be able to sync the streams because it would never get their
> CNAME. I suppose that is the server's fault for not specifying a value
> for the sender reports. I guess this brings up another question. Does it
> make sense for the RS value to be 0?

We are talking here about a case where b=RR is specified to be > 5%,
and b=RS is not specified, so RS would be taken to be zero.  However,
your interpretation of the effect of RS=0 is incorrect.  First, both
RS and RR apply to all RTCP packet types that a participant might
send.  Second, as Magnus and I have been discussing on the list, the
"1/4 rule" still applies when RS and/or RR are/is specified, except
that we have corrected it to be the "RS/(RS+RR) rule".  If RS=0, that
simply means that senders do not have any RTCP bandwidth dedicated to
them, instead they share RTCP bandwith equally with all participants.

I have clarified this in the draft now, during the final stages with
the RFC editor.

                                                        -- Steve



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