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Re: [Sip] SIP backward compatibility issue

At 11:46 AM 12/24/2002 -0500, Jonathan Rosenberg wrote:
Early media was not specified in rfc2543. It did say that you should be prepared to receive media before receiving the answer, which is still the case for 3264. Another issue was that people used to put SDP in non-reliable 1xx responses, and then put the same thing in 2xx. That case is explicitly allowed for in 3261, so it should interoperate as well.

Perhaps you could identify the specific problem you are concerned about?
my concern was SDP in a 18x followed by another 18x/2xx with different SDP. Wouldnt the SDP in the subsequent 18x/2xx be treated differently by 3264 compliant UAs as opposed to earlier 2543 compliant UAs ?

thx,
steve



-Jonathan R.

Steve Levy wrote:



<snip>

rfc3261 is sufficiently backwards compatible with rfc2543. There is no 
need to detect versions or anything. Any backwards compatibility 
functions are built into specific features of rfc3261 that needed to 
support backwards compatibility. If you just implement rfc3261 you will 
be backwards compatible.


<snip>

broadening the discussion to rfc 3264 (offer/answer), isn't there a 
potential for backward compatibility issues with rfc 2543 implementations 
wrt early media ?

thx,

steve


--
Jonathan D. Rosenberg, Ph.D.                72 Eagle Rock Ave.
Chief Scientist                             First Floor
dynamicsoft                                 East Hanover, NJ 07936
jdrosen@dynamicsoft.com                     FAX:   (973) 952-5050
http://www.jdrosen.net                      PHONE: (973) 952-5000
http://www.dynamicsoft.com

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_______________________________________________
Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
This list is for NEW development of the core SIP Protocol
Use sip-implementors@cs.columbia.edu for questions on current sip
Use sipping@ietf.org for new developments on the application of sip