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RE: [AVT] Re: RTP/RTCP Port Sharing -> SCTP

Michael Thomas <mat@cisco.com> Sat, 21 July 2001 16:31 UTC

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From: Michael Thomas <mat@cisco.com>
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Date: Sat, 21 Jul 2001 09:30:56 -0700
To: Jonathan Rosenberg <jdrosen@dynamicsoft.com>
Cc: 'Michael Thomas' <mat@cisco.com>, "Fairlie-Cuninghame, Robert" <rfairlie@nuera.com>, 'Leonid Rosenboim' <Leonid@BitBand.COM>, Ross Finlayson <finlayson@live.com>, avt@ietf.org
Subject: RE: [AVT] Re: RTP/RTCP Port Sharing -> SCTP
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Jonathan Rosenberg writes:
 > Then you read draft-rosenberg-sip-entfw-02.txt, due out this week, which
 > explains how to handle this case.... :) The mechanism in there uses
 > bidirectional streams (which we call symmetric) whenever only one side its
 > natted, and otherwise uses a network intermediary outside of the firewall
 > when both are behind nats that don't support Christian's
 > http://search.ietf.org/internet-drafts/draft-huitema-natreq4udp-00.txt. When
 > contacting this network intermediary, its still useful to use symmetric RTP.

   Sigh. If the end result of most media sessions is a rendezvous
   to a intermediary, then our bragging rights over the IN will
   be nullified. I know that this is the implication of NAT's, but
   it still depresses me.

	    Mike

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