Re: [MMUSIC] Review of 4566bis

Christer Holmberg <christer.holmberg@ericsson.com> Tue, 02 June 2015 09:09 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: "Ali C. Begen (abegen)" <abegen@cisco.com>, Roni Even <ron.even.tlv@gmail.com>, 'Paul Kyzivat' <pkyzivat@alum.mit.edu>, "mmusic@ietf.org" <mmusic@ietf.org>
Thread-Topic: [MMUSIC] Review of 4566bis
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Date: Tue, 2 Jun 2015 09:08:52 +0000
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Subject: Re: [MMUSIC] Review of 4566bis
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Hi,

>>>I do not think that general media level overrides session level value 
>>>works for the b= attribute Roni
>>
>>b= is not an attribute :)
>>
>>Anyway, my suggestion would be that the DEFAULT RULE for all SDP elements that can occur both on session and media level should be that the media level overrides the session level. Then, in cases where it does not apply, it should be explicitly stated.
>
>We can do this, but naturally I will ask everyone to let me know which ones are the exceptions.

I think it should also be added to the pieces of information that must be provided when defining a new information element that can occur both on session- and media level.

Regards,

Christer



>> -----Original Message-----
>> From: mmusic [mailto:mmusic-bounces@ietf.org] On Behalf Of Paul 
>> Kyzivat
>> Sent: 31 May, 2015 8:43 PM
>> To: mmusic@ietf.org
>> Subject: Re: [MMUSIC] Review of 4566bis
>> 
>> On 5/31/15 9:38 AM, Christer Holmberg wrote:
>> 
>> Good list Christer!
>> 
>> I have comments on a few of your issues:
>> 
>> > Q6_2:
>> >
>> > In some of the sub-sections, it is indicated that a media-level 
>> > attribute value overrides a session-level attribute value. As far 
>> > as I know, that applies to all attributes (that can be present both 
>> > on the session-level and media-level), so there should be a generic 
>> > statement about that.
>> >
>> > This is similar to the comment on the c= line.
>> 
>> I used to think this, but I think there are some exceptions. (But I 
>> don't
>offhand
>> remember what they are.)
>> 
>> > Section 6.7:
>> >
>> > ---------------
>> >
>> > Q6-7_1:
>> >
>> > The text says:
>> >
>> >     "If any one of these appears in a media section then it applies 
>> > for
>> >
>> >     that media section.  If none appear in a media section then the 
>> > one
>> >
>> >     from session level, if any, applies to that media section."
>> >
>> > There should be a general statement in the draft about session 
>> > level information applying to the media level.
>> 
>> I wish there could be a general statement, but it is hard, given
>exceptions.
>> Perhaps there could be a general statement with note that it can be
>overridden
>> in particular cases.
>> 
>> But in any case, *this* is different, because it says that the 
>> presence of
>any
>> *one* of four different attributes at media level overrides the 
>> presence
>of any
>> one of those four at session level.
>> 
>> > Section 6.11:
>> >
>> > -----------------
>> >
>> > The text says that the attribute "specifies the language" of the 
>> > session description.
>> >
>> > There has been some confusion about what that really means, so I 
>> > think it would be good to clarify that it applies to any textual 
>> > information that may be provided within the description.
>> >
>> > It would also be good to explicitly indicate that the attribute is 
>> > not related to languages used in the actual media streams.
>> 
>> +1
>> 
>> 	Thanks,
>> 	Paul
>> 
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