Query regarding late 1XX Responses for INVITE Request

Hi,

I have a query regarding late 1XX ( except 100 Trying )
responses received 
by proxy on the same branch, where it has already received
200 OK. ( may 
happen when next hop does forking ).

What should be the expected behavior of proxy in this
scenario? Should the 
proxy absorb the 1XX  ( except 100 Trying ) response or
should it forward 
the response.

RFC 3261 says that :
Until a final response has been sent on the server
transaction, the 
following responses MUST be forwarded immediately:
? Any provisional response other than 100 (Trying)
? Any 2xx response

"After a final response has been sent on the server
transaction, the 
following responses MUST be forwarded immediately:
? Any 2xx response to an INVITE request

So dropping this type of 1XX response may not support
mechanisms like 
precondition etc in IMS.

With Regards
Raghu



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Hi,
please refer the fist 5 lines of section 16.7, rfc 3261

On 11/29/06, Raghu.Gangiaricent.com
<Raghu.Gangiaricent.com> wrote:
>
> Hi,
>
> I have a query regarding late 1XX ( except 100 Trying )
responses received
> by proxy on the same branch, where it has already
received 200 OK. ( may
> happen when next hop does forking ).
>
> What should be the expected behavior of proxy in this
scenario? Should the
> proxy absorb the 1XX  ( except 100 Trying ) response or
should it forward
> the response.
>
> RFC 3261 says that :
> Until a final response has been sent on the server
transaction, the
> following responses MUST be forwarded immediately:
> ? Any provisional response other than 100 (Trying)
> ? Any 2xx response
>
> "After a final response has been sent on the
server transaction, the
> following responses MUST be forwarded immediately:
> ? Any 2xx response to an INVITE request
>
> So dropping this type of 1XX response may not support
mechanisms like
> precondition etc in IMS.
>
> With Regards
> Raghu
>
>
>
> ***********************  Aricent-Private  
***********************
>
> ***********************  Aricent-Private  
***********************
> "DISCLAIMER: This message is proprietary to
Aricent and is intended solely
> for the use of
> the individual to whom it is addressed. It may contain
privileged or
> confidential information and should not be
> circulated or used for any purpose other than for what
it is intended. If
> you have received this message in error,
> please notify the originator immediately. If you are
not the intended
> recipient, you are notified that you are strictly
> prohibited from using, copying, altering, or disclosing
the contents of
> this message. Aricent accepts no responsibility for
> loss or damage arising from the use of the information
transmitted by this
> email including damage from virus."
> _______________________________________________
> Sip-implementors mailing list
> Sip-implementorscs.columbia.edu
> https://lists.cs.columbia.edu/cucslists/listinf
o/sip-implementors
>
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