Re: [MMUSIC] SCTP question: Where does it multiplex?

On 12/03/2012 09:00 AM, Christer Holmberg wrote:
> Hi,
>
> I guess it would be nice to hear from the browser/endpoint people whether they see a need for covering non-RTP in BUNDLE.
>
> If NOT, it would mean a minimum of two 5-tuples, instead of one (one for the bundled RTP media, and one for the data channel).

Speaking with my browser implementor hat on, I want to avoid adding an 
extra 5-tuple for data channels.

Our stats on improvement from the introduction of rtcp-mux were pretty 
compelling that the issue is real.

>
> Regards,
>
> Christer
>
>
>
>
> -----Original Message-----
> From: mmusic-bounces@ietf.org [mailto:mmusic-bounces@ietf.org] On Behalf Of Harald Alvestrand
> Sent: 3. joulukuuta 2012 9:54
> To: mmusic@ietf.org
> Subject: Re: [MMUSIC] SCTP question: Where does it multiplex?
>
> On 12/01/2012 07:09 PM, Paul Kyzivat wrote:
>> I must say that I am getting confused about what is being multiplexed
>> here. We must be very careful to be precise.
>>
>> SCTP defines an *association*, which in simple cases is bound to a
>> 5-tuple. (For now lets not talk about the cases where each end can
>> have more than one address.)
>>
>> SCTP multiplexes multiple one-way *streams* over an association.
>> (These are not RTP streams.)
>>
>> RTCWEB binds pairs of sctp-streams together into *channels*.
> I'm not talking about any of these levels. I'm talking about the reuse of the RTP session's 5-tuple for the DTLS/SRTP 5-tuple, as described in RFC 5764 section 5.1.2.
>
> I said the same thing earlier on this thread (Nov 5), when you first responded (thanks for being the first responder!)
>
> You do make the point that the term "multiplex" is so over-used, it should probably be abandoned altogether - but that section talks about (de)multiplexing, so changing terminology is probably too late for that particular usage.
>
>                 Harald
>
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