Re: [MMUSIC] JSEP Issue #394: What appears in m= lines.

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 16 January 2017 16:10 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Eric Rescorla <ekr@rtfm.com>
Thread-Topic: [MMUSIC] JSEP Issue #394: What appears in m= lines.
Thread-Index: AQHSXHlOCQ7BQRm6Y0eHkrCi1urD06ElMmaAgAy0twCACUUOAIAAJN0A///iwICAADeE8A==
Date: Mon, 16 Jan 2017 16:09:49 +0000
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Cc: Magnus Westerlund <magnus.westerlund@ericsson.com>, mmusic WG <mmusic@ietf.org>
Subject: Re: [MMUSIC] JSEP Issue #394: What appears in m= lines.
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Hi,

…

>>>>I hope at least we can agree that an JSEP Answer MUST use the PROTO string of the OFFER?
>>>>
>>>Yes. I think implementations should offer UDP/ (ICE/ will cause problems) and in the answer echo the offer.
>>
>> This is related to the generic issue I raised in Seoul, and sent an e-mail about last week: is it ok to echo 
>> the transport in the m- line proto value of the answer even if the answerer doesn’t support the transport (alt #1)?
>>
>> OR, should we mandate a transport that everyone must support, and mandate to use that transport as m- line proto value in offers and answers (alt #2)?
>>
>> People in Seoul preferred alt #1, but I know that at least Roman prefers alt #2.
>
> I continue to support #1. We should just stop trying to pretend that this value has useful semantics.

As #1 was also the outcome of Seoul, I think we should move ahead with it. Chairs?

Note that #1 does not prevent individual protocols from defining MTI transports, default m- line proto values etc,  but it would not be a general requirement to do so.

Regards,

Christer