Re: [rtcweb] Summary of ICE discussion

"Ravindran Parthasarathi" <> Wed, 05 October 2011 06:05 UTC

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Date: Wed, 5 Oct 2011 11:37:32 +0530
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Thread-Topic: [rtcweb] Summary of ICE discussion
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From: "Ravindran Parthasarathi" <>
To: "Magnus Westerlund" <>, <>
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Subject: Re: [rtcweb] Summary of ICE discussion
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In case user consent is the reason for ICE, ICE may not be right choice because of the multiplexing RTP in RTCWeb and user may be consent for audio and not for video which is not possible to indicate through ICE. It is possible to achieve by having different streams for each media but I strongly believe that it is not interesting topic for RTCWeb.

I think that trust model with browser---RTCWeb server---browser for the user consent with individual media stream works because browser user trust RTCWeb server. I could think of offer/answer as user consent with media stream mechanism because offer or answer indicates media port is allocated in browser and listening for media from remote party, the consent reaches remote browser through RTCWeb server. The advantage in the model is that RTCWeb server shall have the policy to control media. Please let me know your comments on this.

The other reason like NAT & FW is not mandatory for intranet RTCWeb applications. I have mentioned as part of


>-----Original Message-----
>From: [] On Behalf
>Of Magnus Westerlund
>Sent: Tuesday, October 04, 2011 8:03 PM
>Subject: [rtcweb] Summary of ICE discussion
>I have bellow tired to summarize the result of the ICE discussion. This
>is intended as furthering this discussion and form a basis for going
>forward in the consensus process. I do expect people that disagree with
>my summary of the discussion to speak up.
>Major requirements
>- Need for data transmission consent for protocols using UDP as the
>traffic receiver needs to consent to receiving the data
>- Perform NAT and FW traversal when ever needed
>- Support IPv4 to IPv6 transition
>Desired behavior:
>- Be interoperable with deployed legacy systems as SIP Trunk, PSTN
>gateways, VoIP phones.
>WG chairs conclusion of discussion so far:
>- ICE is so far the only solution that provides the security goals and
>have any legacy deployment.
>- ICE usage will require that STUN connectivity MUST have succeeded
>prior to any data transmission to fulfill security goals.
>  * The Browser will enforce this requirement to prevent being an attack
>vector in all cases.
>- If anyone can find a solution that fulfill the security goals and have
>improved legacy interoperability people would be interested in that
>solution. So far RTCP has been discarded as insufficient.
>- Media Gateway can support a reduced functionality set from Full ICE
>Magnus Westerlund
>as WG chair
>Multimedia Technologies, Ericsson Research EAB/TVM
>Ericsson AB                | Phone  +46 10 7148287
>Färögatan 6                | Mobile +46 73 0949079
>SE-164 80 Stockholm, Sweden| mailto:
>rtcweb mailing list