Sagar,
Think of it like declarations in nested scopes in a programming language.
The outer (session level) scope applies except where overridden by a
redeclaration in an inner (media level) scope.
This applies to a lot, but not all, attributes. (The ones that may be
used at "both" session and media level. IMO it *ought* to apply to them
all, but that is another story.) It also applies to c=.
Thanks,
Paul
sagar sheth wrote:
> Hello Friends,
>
> I have query regarding the usage of "a=" attribute at session and media
> level. Anything above m line in SDP is considered in session and below m
> line is considered as media.
> "a" which defines the direction of the stream can be used in media and
> session. So my questions are
>
>>> What is difference/advantage of using "a" in media over session?
> Is it if more than media stream is present, its direction can be
> treated Independently?
>
> >>Also What if "a" is present at both media & session level?
>
> Thanks!
> Sagar
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