Return-Path: X-Original-To: rtcweb@ietfa.amsl.com Delivered-To: rtcweb@ietfa.amsl.com Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 4364921F8C6D for ; Thu, 20 Oct 2011 09:48:23 -0700 (PDT) X-Virus-Scanned: amavisd-new at amsl.com X-Spam-Flag: NO X-Spam-Score: -102.426 X-Spam-Level: X-Spam-Status: No, score=-102.426 tagged_above=-999 required=5 tests=[AWL=0.172, BAYES_00=-2.599, HTML_MESSAGE=0.001, USER_IN_WHITELIST=-100] Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id OKU3brperr7P for ; Thu, 20 Oct 2011 09:48:22 -0700 (PDT) Received: from blu0-omc1-s28.blu0.hotmail.com (blu0-omc1-s28.blu0.hotmail.com [65.55.116.39]) by ietfa.amsl.com (Postfix) with ESMTP id 57B0021F8C68 for ; Thu, 20 Oct 2011 09:48:22 -0700 (PDT) Received: from BLU152-W65 ([65.55.116.9]) by blu0-omc1-s28.blu0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4675); Thu, 20 Oct 2011 09:48:21 -0700 Message-ID: Content-Type: multipart/alternative; boundary="_6cb35439-6428-4cfa-aa48-e312d655682f_" X-Originating-IP: [24.17.217.162] From: Bernard Aboba To: Date: Thu, 20 Oct 2011 09:48:21 -0700 Importance: Normal In-Reply-To: References: , , MIME-Version: 1.0 X-OriginalArrivalTime: 20 Oct 2011 16:48:21.0753 (UTC) FILETIME=[13AE9E90:01CC8F48] Cc: rtcweb@ietf.org Subject: Re: [rtcweb] Same location media X-BeenThere: rtcweb@ietf.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Real-Time Communication in WEB-browsers working group list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Oct 2011 16:48:23 -0000 --_6cb35439-6428-4cfa-aa48-e312d655682f_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Roman said: "Technically speaking=2C if TURN server relay address is used=2C connectivi= ty between the RTC client and TURN server can be TCP (or TLS). So=2C ICE ch= eck would be delivered to the RTC client via TCP tunnel." [BA] Yes=2C that can be done. But often we find that a firewall that does = not permit UDP traversal also has strict policies about TCP (e.g. only to a= strict set of destination ports). This is why HTTP traversal is impleme= nted by almost all Web conferencing services.=20 = --_6cb35439-6428-4cfa-aa48-e312d655682f_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Roman said:

"Technically speaking=2C if TURN server relay address is= used=2C connectivity between the RTC client and TURN server can be TCP (or= TLS). So=2C ICE check would be delivered to the RTC client via TCP tunnel.= "

[BA] Yes=2C that can be done. =3B But often we find that a fir= ewall that does not permit UDP traversal also has strict policies about TCP= (e.g. only to a strict set of destination ports). =3B =3B =3B = This is why HTTP traversal is implemented by almost all Web conferencing se= rvices.

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