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Re: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 14 May 2020 16:46 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16
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Date: Thu, 14 May 2020 16:46:06 +0000
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Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16
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Hi,
  
  >  I don't know. I'm trying to understand the intended usage and how it 
  >  plays out in the example. If what I have in my address book for you is 
  >  just your sip URI, then how do I figure out how to establish a chat 
  >  session? How do I decide to use a data channel rather than MSRP over 
  >  TLS? 

   That is based on your local preferences, whatever your SIP (or whatever signaling protocol you use) client puts in the offer. In the same way it decides if it offers audio, video etc.

   > And do I just somehow derive the msrp URL from your sip URL?

   You don't need to derive it. The applications will create the msrp URLs and exchange them in O/A.

    > I guess if I am running in a browser and using WebRTC then I try a data 
    > channel because there is no alternative I can use. But that isn't this 
    > example. Must I have something else in my address book to tell me what 
    > you support? Or should I be trying both in my invite and seeing what you 
    > accept? (That also isn't this example.)

    You don't need to have anything. You send an offer, offer me MSRP, and if I support/accept it I send you MSRP back in the answer.

    This is no different from any other type of media...

    Regards,

    Christer

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