Subject: RE: [Sip] Question regarding Proxy forwarding 2XX responses

From: "Chris Boulton" <[email-masked]>
Date: Wed, 1 Oct 2003 16:28:57 +0100

Greg,
	You should really be putting these type of questions to the
sip-implemetors list ;-)

<<See comment>>

Chris.

>-----Original Message-----
>From: Greg Scallan [mailto:[email-masked]]
>Sent: 01 October 2003 16:20
>To: Chris Boulton; [email-masked]
>Subject: RE: [Sip] Question regarding Proxy forwarding 2XX responses
>
>Thank you, another question then:
>
>If the same proxy decided instead forwarded the INVITE to UAS1, then
>received a 4XX response, can the SIP Proxy subsequently decide to
forward
>the INVITE to UAS2 and upon receiving a 2XX response, only forward the
2XX
>response and not the 4XX response?

[Chris Boulton] If you have two potential locations (e.g. as part of a
location lookup) you can fork sequentially, and then pick the best
response (200 OK in your example) and only forward this to the
originator(UAC).

>
>It was unclear to me from reading the spec if this is allowed because
RFC
>3261 seemed to indicate that when the Proxy server received the final
>response for all outstanding client transactions that it MUST forward
the
>"best response".  In this case, we don't like the best response and
want to
>retry additional UAS's.
>
>thanks,
>greg
>
>-----Original Message-----
>From: Chris Boulton [mailto:[email-masked]]
>Sent: Wednesday, October 01, 2003 8:09 AM
>To: Greg Scallan; [email-masked]
>Subject: RE: [Sip] Question regarding Proxy forwarding 2XX responses
>
>
>All.
>
>>-----Original Message-----
>>From: Greg Scallan [mailto:[email-masked]]
>>Sent: 01 October 2003 15:59
>>To: [email-masked]
>>Subject: [Sip] Question regarding Proxy forwarding 2XX responses
>>
>>Hi All,
>>
>>	Was hoping someone could help clarify the following question.
>>Assuming RFC 3261 compliance, Does a SIP Proxy server acting in a
>>transaction stateful manner *have to* forward *all* 2XX responses
>received
>>as a result of an INVITE that had been forwarded to multiple UAS's?
Or,
>can
>>the Proxy decide to only forward the first one received?
>>
>>Thanks,
>>greg
>>
>>
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_______________________________________________
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This list is for NEW development of the core SIP Protocol
Use [email-masked] for questions on current sip
Use [email-masked] for new developments on the application of sip