Subject: RE: [BEHAVE] [Fwd: LastCall:draft-wing-behave-symmetric-rtprtcp(Co mmon Local TransmitandReceive Ports (Symmetric RTP)) toInformational RFC]

From: "Denis-Courmont Remi \(Nokia-TP-MSW/Helsinki\)" <[email-masked]>
Date: Tue, 13 Feb 2007 21:07:24 +0200

Hmm... Bypassing TURN relays might be tempting but IMHO you should stick to whatever ICE yield. If only one TURN relay is needed, ICE ought to find it out. Otherwise, it could that policy mandates TURN or whatever requires relays on both sides...

Rémi Denis-Courmont

--- message original ---
De : "ext David Barrett" <[email-masked]>
Objet : RE: [BEHAVE] [Fwd: LastCall:draft-wing-behave-symmetric-rtprtcp(Common Local TransmitandReceive Ports (Symmetric RTP)) toInformational RFC]
Date : 13 février 2007
Heure : 22:56:18

Though I think it's still a good recommendation, one thing I found when
working on iGlance was the case where two users were each behind a different
TURN relay server.

With symmetric RTP (if I understand correctly), for me to send a packet to
you I need to send it up to my TURN server, which forwards it to your TURN
server, which sends it to you.  Ideally I'd send it to your TURN server
direct, and cut out one relay.

The problem with this is it means our RTP isn't strictly symmetric -- I
receive from one place (my TURN server), but send to another (your TURN
server).

Am I misunderstanding how symmetric RTP works?  Perhaps this is too minor a
point to discuss here, however.

-david

> -----Original Message-----
> From: Dan Wing [mailto:[email-masked]]
> Sent: Tuesday, February 13, 2007 12:44 PM
> To: 'Magnus Westerlund'
> Cc: [email-masked]; 'IETF AVT WG'
> Subject: RE: [BEHAVE] [Fwd: Last Call:draft-wing-behave-symmetric-
> rtprtcp(Common Local Transmit andReceive Ports (Symmetric RTP))
> toInformational RFC]
> 
> Per Francois's suggestion, the following new text would be placed at the
> end
> of section 3 of draft-wing-behave-symmetric-rtprtcp:
> 
>   "For these reasons it is RECOMMENDED that symmetric RTP and
>    symmetric RTCP always be used for bi-directional RTP media
>    streams."
> 
> -d
> 
> > -----Original Message-----
> > From: Magnus Westerlund [mailto:[email-masked]]
> > Sent: Tuesday, February 13, 2007 12:17 PM
> > To: Magnus Westerlund
> > Cc: [email-masked]; IETF AVT WG
> > Subject: Re: [BEHAVE] [Fwd: Last Call:
> > draft-wing-behave-symmetric-rtprtcp(Common Local Transmit and
> > Receive Ports (Symmetric RTP)) toInformational RFC]
> >
> > There has been raised a comment that this document should contain a
> > normative recommendation on using symmetric ports. However to
> > make this
> > happen the document would need to be a BCP. I am willing to consider
> > this but would like to have AVT and Behave WG participant's view on
> > doing this before progressing down that road and updating the
> > IETF last
> > call. So please provide comments by Tuesday 20th of Feb on this issue.
> >
> > Best Regards
> >
> > Magnus
> >
> > Magnus Westerlund skrev:
> > > Hi,
> > >
> > > This document has been raised before in both AVT and BEHAVE
> > WG. I have
> > > chosen to AD sponsor this document for publication as informational
> > > status because it seems to be of general interest. You have
> > 4 weeks to
> > > provide any comments on the document.
> > >
> > > Magnus Westerlund
> > >
> > > IETF Transport Area Director & TSVWG Chair
> > >
> > ----------------------------------------------------------------------
> > > Multimedia Technologies, Ericsson Research EAB/TVA/A
> > >
> > ----------------------------------------------------------------------
> > > Ericsson AB                | Phone +46 8 4048287
> > > Torshamsgatan 23           | Fax   +46 8 7575550
> > > S-164 80 Stockholm, Sweden | mailto: [email-masked]
> > >
> > ----------------------------------------------------------------------
> > >
> > >
> > --------------------------------------------------------------
> > ----------
> > >
> > > Ämne:
> > > Last Call: draft-wing-behave-symmetric-rtprtcp (Common
> > Local Transmit
> > > and Receive Ports (Symmetric RTP)) to Informational RFC
> > > Från:
> > > The IESG <[email-masked]>
> > > Datum:
> > > Mon, 12 Feb 2007 15:44:51 -0500
> > > Till:
> > > IETF-Announce <[email-masked]>
> > >
> > > Till:
> > > IETF-Announce <[email-masked]>
> > >
> > >
> > > The IESG has received a request from an individual
> > submitter to consider
> > > the following document:
> > >
> > > - 'Common Local Transmit and Receive Ports (Symmetric RTP) '
> > >    <draft-wing-behave-symmetric-rtprtcp-01.txt> as an
> > Informational RFC
> > >
> > > The IESG plans to make a decision in the next few weeks,
> > and solicits
> > > final comments on this action.  Please send substantive
> > comments to the
> > > [email-masked] mailing lists by 2007-03-12. Exceptionally,
> > > comments may be sent to [email-masked] instead. In either
> > case, please
> > > retain the beginning of the Subject line to allow automated sorting.
> > >
> > > The file can be obtained via
> > >
> > http://www.ietf.org/internet-drafts/draft-wing-behave-symmetri
> > c-rtprtcp-01.txt
> > >
> > >
> > > IESG discussion can be tracked via
> > >
> > https://datatracker.ietf.org/public/pidtracker.cgi?command=vie
> > w_id&dTag=13165&rfc_flag=0
> > >
> > >
> > > _______________________________________________
> > > IETF-Announce mailing list
> > > [email-masked]
> > > https://www1.ietf.org/mailman/listinfo/ietf-announce
> > >
> > >
> > >
> > >
> > --------------------------------------------------------------
> > ----------
> > >
> > > _______________________________________________
> > > Behave mailing list
> > > [email-masked]
> > > https://www1.ietf.org/mailman/listinfo/behave
> >
> >
> > --
> >
> > Magnus Westerlund
> >
> > IETF Transport Area Director & TSVWG Chair
> > ----------------------------------------------------------------------
> > Multimedia Technologies, Ericsson Research EAB/TVA/A
> > ----------------------------------------------------------------------
> > Ericsson AB                | Phone +46 8 4048287
> > Torshamsgatan 23           | Fax   +46 8 7575550
> > S-164 80 Stockholm, Sweden | mailto: [email-masked]
> > ----------------------------------------------------------------------
> >
> > _______________________________________________
> > Behave mailing list
> > [email-masked]
> > https://www1.ietf.org/mailman/listinfo/behave
> 
> _______________________________________________
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