Re: [Sipping] Possible Solution to HERFP

Rohan,

About the HERFP issue. I was not involved in earlier discussions, so I 
apologize if I am repeating something that was already said

What if HERFP was addressed similar to how a proxy handles multiple 401+407 
responses: all repairable errors are collected and returned as one final 
response ( "4xx multiple responses" with the proxy generating a to-tag). The 
UA could then retry as its sees fit. Each error returned in this way should 
include an address to use to contact that specific entity only. The response 
body would probably be a good place for this collection of mayhem

To address the potential long waiting for some ringing endpoints that block 
forwarding of repairable errors, the UAC could simply include an 'Expires' 
header in the original INVITE, and/or maybe a special 'HERFP timeout' value 
to tell the proxy to CANCEL ringing things and return the best final 
response(s) at that point instead.

To address 2xx responses from hiding other alternatives, the proxy could 
append information about the pending repairable errors to the 2xx response 
before forwarding (for this case perhaps some header would be better than in 
the body). That would give the UAC an opportunity to try those other 
options. If some other branches have not returned yet, perhaps the proxy 
could append a header stating that ( i.e. "Proxy-HERFP-Pending: 3" )

Regards,

Jeroen

----- Original Message ----- 
From: "Rohan Mahy" <rohan@ekabal.com>
To: "'sipping' WG" <sipping@ietf.org>
Cc: "Rohan Mahy" <rohan@ekabal.com>
Sent: Saturday, July 09, 2005 4:41 AM
Subject: [Sipping] Possible Solution to HERFP

> Hi Folks,
>
> I just submitted a new individual I-D that describes a possible  solution 
> to the Heterogeneous Error Response Forking Protocol.  Until  it appears 
> in the archives, you can find it here:
>
> https://scm.sipfoundry.org/rep/ietf-drafts/rohan/herf-fix/draft-mahy- 
> sipping-herfp-fix-00.txt
> https://scm.sipfoundry.org/rep/ietf-drafts/rohan/herf-fix/draft-mahy- 
> sipping-herfp-fix-00.html
>
> thanks,
> -rohan
> (as an individual)
>
>
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_______________________________________________
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