Re: [MMUSIC] Draft-ietf-mmusic-rfc4566bis-05: session-level attributes

[Paul Kyzivat <[e-mail]>]

While bandwidth has that property, it's not an *attribute*.
I was thinking that there is at least one attribute like that.
But I don't recall a specific one. :-(
It would be good if I'm wrong.

	Thanks,
	Paul

On 8/28/12 4:43 AM, Miguel A. Garcia wrote:
> Resent. I wanted to include Ali in the discussion, but I failed at first
> time.
>
> /Miguel
>
> On 28/08/2012 10:40, Miguel A. Garcia wrote:
>> Hi Paul,
>>
>> perhaps you are thinking of the Bandwidth modifier for SDP, RFC 3890.
>> Section 6.2.2. says:
>>
>>     A new session and media level bandwidth modifier is defined:
>>
>>        b=TIAS:<bandwidth-value> ; see section 6.6 for ABNF definition.
>>
>>     The Transport Independent Application Specific Maximum (TIAS)
>>     bandwidth modifier has an integer bit-rate value in bits per second.
>>     A fractional bandwidth value SHALL always be rounded up to the next
>>     integer.  The bandwidth value is the maximum needed by the
>>     application (SDP session level) or media stream (SDP media level)
>>     without counting IP or other transport layers like TCP or UDP.
>>
>>     At the SDP session level, the TIAS value is the maximal amount of
>>     bandwidth needed when all declared media streams are used.  This MAY
>>     be less than the sum of all the individual media streams values.
>>     This is due to the possibility that not all streams have their
>>     maximum at the same point in time.  This can normally only be
>>     verified for stored media streams.
>>
>> Is this the example you were looking for?
>>
>> /Miguel
>>
>> On 27/08/2012 19:03, Paul Kyzivat wrote:
>>> I've always thought this should be the way things work, for all
>>> attributes. But somewhere I came across an attribute (sorry, don't
>>> remember which one) where the attribute at session level means something
>>> different than the attribute at media level, and so can't be treated as
>>> a default for media level. (E.g. the session level is an aggregate limit
>>> for something, while the media level is a limit for a single m-line.)
>>>
>>> Am I just dreaming this? Or can someone identify specific attributes
>>> that behave this way?
>>
>