Correct.  The ACK will just be sent to the IP address from which the
error response was received and not based on to where the original
INVITE was proxied.

Regards,


Tina Iliff

-----Original Message-----
From: Byron Campen [mailto:bcampen@esta...]
Sent: Wednesday, June 06, 2007 1:31 PM
To: Adam Roach
Cc: Iliff, Tina; sipping@ietf...; sip-implementors@cs.c...;
Gilad Shaham
Subject: Re: [Sipping] Proxy acting as UAS -- CANCEL scenario


On Jun 6, 2007, at 1:24 PM, Adam Roach wrote:

> On 6/6/07 12:45 PM, Gilad Shaham wrote:
>> ACKing stray responses is something that could have some issues:
>> * Not all error responses have contact headers and in that case it's
>> impossible to know the destination.
>> * Contact headers may be different than the original request URI
>> which may cause the ACK of an error response to go through a
>> different path.
>
>
> The ACK for an _error_ response ignores the contact -- it's sent to
> the same IP address and port as the original INVITE was.
>
> /a

But we don't have this info anymore; the transaction is not
there.

Best regards,
Byron Campen

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