[SIPForum-discussion] [Sip-implementors] Offer in a 200OK for Invite transaction.

[Somesh S Shanbhag]

Hi Markus,

I think the expected behavior from UAS is it MUST not include two different SDP's in 18x(non-reliable) and 200 responses.

But if it does that also section 13.2.1 of RFC 3261 mentions UAC to ignore the
answer in 200 when it has received the answer in 18x (non-reliable).

Thanks
Somesh S. Shanbhag

Markus Hofmann <mhofmann at nero.com> wrote: Hi Somesh,

I have question related to this.

What is the right behaviour (sending out INVITE with SDP offer) if SDP
in 18x (non-reliable) and 2xx are different? Sending ACK / BYE? Ignoring
2xx SDP?

Regards
Markus

Somesh S Shanbhag wrote:
> Hi Manpreet,
>   
>   RFC 3261 section 13.2.1 has the following clause ...
>   
>   "
>   
> If the initial offer is in an INVITE, the answer MUST be in a
> reliable non-failure message from UAS back to UAC which is
> correlated to that INVITE.  For this specification, that is
> only the final 2xx response to that INVITE.  That same exact
> answer MAY also be placed in any provisional responses sent
> prior to the answer.  The UAC MUST treat the first session
> description it receives as the answer, and MUST ignore any
> session descriptions in subsequent responses to the initial 
> INVITE
> "
> 
> So, UAC MUST treat 183 session progress as the answer and
> shall ignore in subsequent responses to INVITE.
> 
> Hope this helps
> Thanks
> Somesh S. Shanbhag
> 
>   
> 
> Manpreet Singh  wrote:              For the INVITE   transaction where the offer was sent in an INVITE and the answer coming back in   183, would it be valid to send a new offer in the 200OK? So the question is   whether the 200OK can be used to send a "new" Offer ( different from the answer   in 183 ) for the INVITE transaction once 183 has completed the offer/answer   part of that transaction. Only UPDATE can be used for early dialog changes as   per my understanding and a 200OK still constitutes early dialog so it wont   be valid to send a new offer in 200OK? Although 200OK can carry the same SDP as   183 which would mean nothing or would not be considered as early dialog change   in capability.
>    
>   Please correct me if   I am wrong.
>    
>   Thanks
>    
>   Manpreet   
> _______________________________________________
> discussion mailing list
> discussion at sipforum.org
> http://sipforum.org/mailman/listinfo/discussion
> 
> 
> 
> -----------------------------------------
> SIMPLICITY IS THE BEAUTY.
> BE NATURAL LIVE NATURAL.
> -----------------------------------------
> Somesh S. Shanbhag
> Focus Area - VoIP Team (FA-VoIP)
> Mascon Global Communication Technologies
> Enterprise of Mascon Global Limited
> #59/2, 100Ft Ring Road
> Banashankari II stage
> Bangalore-560070
> Karnataka
> INDIA
> Website: http://www.mgl.com/
> -----------------------------------------
>    
> ---------------------------------
> Do you Yahoo!?
>  Get on board. You're invited to try the new Yahoo! Mail Beta.
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementors at cs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors



-----------------------------------------
SIMPLICITY IS THE BEAUTY.
BE NATURAL LIVE NATURAL.
-----------------------------------------
Somesh S. Shanbhag
Focus Area - VoIP Team (FA-VoIP)
Mascon Global Communication Technologies
Enterprise of Mascon Global Limited
#59/2, 100Ft Ring Road
Banashankari II stage
Bangalore-560070
Karnataka
INDIA
Website: http://www.mgl.com/
-----------------------------------------
 		
---------------------------------
Talk is cheap. Use Yahoo! Messenger to make PC-to-Phone calls.  Great rates starting at 1¢/min.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20060720/c4e9416c/attachment-0005.html>