Re: Early-media

What would be the issue if they are not the same ?? 


Siva M 
-----Original Message-----
From: Sarkar, Uttam [mailto:Uttam.SarkarIntelliverse.com] 
Sent: Friday, April 20, 2007 7:49 PM
To: Siva M-Q16748; sip-implementorscs.columbia.edu
Subject: RE: [Sip-implementors] Early-media

SDP in 183 and 200 must be same. 

-----Original Message-----
From: sip-implementors-bouncescs.columbia.edu
[mailto:sip-implementors-bouncescs.columbia.edu] On Behalf
Of Siva
M-Q16748
Sent: Friday, April 20, 2007 10:13 AM
To: sip-implementorscs.columbia.edu
Subject: [Sip-implementors] Early-media


Can the SDP of 183 and 200 OK be different
 
I read somewhere that they should be the same
 
If so , Is there any Logical reason why these two should be
different ??
 
Siva M


Siva M 

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This violates the Offer/Answer model.  See RFC 3264.  The
SDP in INVITE is
the offer, and the SDP in 183 if present, it is early
answer.  So, if an
answer is generated in 183, the same MUST be used in 200 OK
too.  Suppose
the 200 OK choose to send different SDP, then it may be
achieved by using
different To Tag, and the caller will handle as faked forked
call and accept
the modified SDP in 200 OK.

Thanks,
Neel


> -----Original Message-----
> From: sip-implementors-bouncescs.columbia.edu
[mailto:sip-implementors-
> bouncescs.columbia.edu] On Behalf Of Siva M-Q16748
> Sent: Friday, April 20, 2007 9:18 AM
> To: Sarkar, Uttam; sip-implementorscs.columbia.edu
> Subject: Re: [Sip-implementors] Early-media
> 
> What would be the issue if they are not the same ??
> 
> 
> Siva M
> -----Original Message-----
> From: Sarkar, Uttam [mailto:Uttam.SarkarIntelliverse.com]
> Sent: Friday, April 20, 2007 7:49 PM
> To: Siva M-Q16748; sip-implementorscs.columbia.edu
> Subject: RE: [Sip-implementors] Early-media
> 
> SDP in 183 and 200 must be same.
> 
> -----Original Message-----
> From: sip-implementors-bouncescs.columbia.edu
> [mailto:sip-implementors-bouncescs.columbia.edu] On Behalf
Of Siva
> M-Q16748
> Sent: Friday, April 20, 2007 10:13 AM
> To: sip-implementorscs.columbia.edu
> Subject: [Sip-implementors] Early-media
> 
> 
> Can the SDP of 183 and 200 OK be different
> 
> I read somewhere that they should be the same
> 
> If so , Is there any Logical reason why these two
should be different ??
> 
> Siva M
> 
> 
> Siva M
> 
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
> 
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors


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