Thank you Friends :-)
---------- Forwarded message ----------
From: Paul Kyzivat <pkyzi...@cisco.com>
Date: Wed, Aug 18, 2010 at 7:44 PM
Subject: Re: [Sip-implementors] "a=" attribute in media and session (SDP)
To: sagar sheth <seth.sa...@gmail.com>
Cc: sip-implementors@lists.cs.columbia.edu
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
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors@lists.cs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>
>
_______________________________________________
Sip-implementors mailing list
Sip-implementors@lists.cs.columbia.edu
https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
