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Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-mix Issue 1: transport

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 18 May 2020 19:20 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Gunnar Hellström <gunnar.hellstrom@ghaccess.se>, "avt@ietf.org" <avt@ietf.org>
Thread-Topic: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-mix Issue 1: transport
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Subject: Re: [AVTCORE] draft-ietf-avtcore-multi-party-rtt-mix Issue 1: transport
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Hi,

    >>> I think this means we use the WebRTC data channel, which is HTTP based, right?  Totally bypasses the SBC.  Have to be careful
    >>> to not cause the SBC to get confused with the SDP.
    >> The WebRTC data channel is not HTTP based. It is basically an SCTP stream.
    >
    > Yes, with UDP as the lowest layer.
    >
    > So we are talking about two UDP based transports.
    >
    > text/red and text/rex are RTP based, and may be SRTP encrypted. They are 
    > declared in the same m-line, and one selected and then will use one or 
    > two ports.
    >
    > WebRTC data channels stack is UDP/DTLS/SCTP.
    >
    > Both would normally use ICE to find their ways through networks.
    >
    > Do we really have noticable differences in how hard it would be to get 
    > through the networks with any of these? And would there be any other 
    > transport that would be easier to get through?

    I really think we should aim for an RTP based solution. 4103 is already out there, and possible extensions are much easier to adopt than something completely new.

    In addition, we can for sure also define a WebRTC based solution, but that should not be the only solution.

    Regards,

    Christer

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