Re: [Sip] Preventing unanticipated respondent syndrome when retargeting

[Dean Willis <dean.willis at softarmor.com>]

On Apr 4, 2008, at 2:45 AM, Hans Erik van Elburg wrote:
> Dean mumbled:
>> I therefore propose a provisional response from Proxy to Alice, which
>> I'll provisionally call "121 (Retargeting)"
> Is this any different then 181 Call Is Being Forwarded from RFC3261?

Well, 181 is rather totally unspecified, AFAIK.

Th main difference is that the proposed 121 has a Contact that tells  
you where the call is being forwarded. It also specifically means that  
the call was "retargeted" meaning that the anticipated respondent has  
changed.

It might be reasonable to "further specify" 181 to mean the same  
thing, since, AFAIK, nobody ever actually used 181 for anything.

John Elwell made a try at it in draft-elwell-sipping-redirection- 
reason-01, but this lacked the whole "Contact" parameter bit that  
tells the recipient where the call is being forwarded to.

--
Dean

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