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

[Christer Holmberg <[e-mail]>]

Hi Paul,

In order to establish communication you need to establish the data channel, and then you include the MSRP URI in the MSRP messages sent on that data channel.

But, again, you don't need the MSRP URI for establishing the data channel.

Regards,

Christer

________________________________
From: mmusic <[e-mail]> on behalf of Paul Kyzivat <[e-mail]>
Sent: Monday, May 11, 2020 12:19 AM
To: [e-mail] <[e-mail]>
Subject: Re: [MMUSIC] WGLC on draft-ietf-mmusic-msrp-usage-data-channel-16

On 5/10/20 3:29 PM, Christer Holmberg wrote:

>>> "This document RFC 4975, by allowing the usage of the "msrps" scheme
>>> when the underlying connection is protected with DTLS."
>>
>> The key is ensuring that the required usage is clear and unambiguous.
>> Specifically, ISTM that a "msrps" URI together with a "dc" parameter
>> implies that connecting to this requires use of a data channel over a
>> DTLS association established using the address in the URI.
>>
>>> Following up on that, a question about the example in 4.8:
>>>
>>> The path attribute includes:
>>>
>>>    msrps://bob.example.com:54111/si438dsaodes;dc
>>
>> but the corresponding c= is:
>>
>>    c=IN IP4 198.51.100.79
>>
>> Am I to infer that =IN IP4 198.51.100.79 is the resolution of
>> bob.example.com:54111? If so, why doesn't the c= reference
>> bob.example.com:54111?
>
> I think we should remove the port number for the path attribute.
>
> As you know, we have tried to make it clear that the msrp URI is not
> used for routing, and that the path can be set to anything.
>
> Do you want the address and port of the path URI to match the c= line?

My thought is: what do I start with in order to establish communication
with you? In this case I'm thinking it is the msrps URI. Starting with
only that as my knowledge about you, how do I set up a connection?

I hope it isn't necessary to know anything else. If not, then I suggest
that the example proceed on that basis.

        Thanks,
        Paul

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