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Re: [MMUSIC] MSRP data channel and CEMA

Jose M Recio <jose@ch3m4.com> Wed, 14 August 2019 12:34 UTC

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To: mmusic@ietf.org
References: <A1B7047A-BA0A-4766-B077-1D9F16F8F57B@ericsson.com>
From: Jose M Recio <jose@ch3m4.com>
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Date: Wed, 14 Aug 2019 20:34:29 +0800
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Subject: Re: [MMUSIC] MSRP data channel and CEMA
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On 12/08/19 01:50, Christer Holmberg wrote:
>
> Hi,
>
> I was thinking more about CEMA and MSRP data channels.
>
> RFC 6714 says:
>
> “MSRP endpoints that support the CEMA extension will use the SDP 
> c/m-line address
>
> information for establishing the TCP or TLS connection for sending
>
> and receiving MSRP messages.”
>
> …which is exactly what is done when a data channel is established.
>
> Of course, the data channel will be established using the c/m- line no 
> matter whether CEMA is indicated or not, but I think it would be good 
> to have it explicit.
>
Thinking about it, I think one possible approach to make it more clear 
could be: 1) mandate that endpoints include the CEMA attribute , and 2) 
specify that transport level gateways should not forward CEMA attributes 
from/to data channel endpoints.

1 makes possible removing all the convoluted statements we have right 
now on path (not using path for transport, and so on), as CEMA does 
exactly that.

2 would avoid any possible issue with endpoints not understanding the 
data channel characteristics.

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