Thanks for the response.  Reply inline.

> I'm not sure if this was mentioned before, but 3262 clearly 
> states that you MUST send 2xx:
> 
>  "If the PRACK does match an unacknowledged reliable provisional
>   response, it MUST be responded to with a 2xx response."
> 
> But I guess that's part of the debate you speak of.

Yep; that is part of the debate.


> If one follows the guidance in RFC 5057, then a 481 would 
> destroy the INVITE usage for the dialog and likely the dialog 
> since that's probably its only usage.

Since RFC 3262 allows the PRACK 481 to be sent for a known dialog (similar to 
CANCEL), it sound like there is a problem with RFC 5057 section 5.1 note 8.


> It seems to me that RFC 3262 ought to have allowed a 488 
> response if the headers/content of the PRACK were not acceptable.

It does; however it depends upon who you ask. :)



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