Hi Udaya,

ACK requests for non-2xx responses, and CANCEL requests, are sent to the same
address/port as the INVITE was sent.

Regards,

Christer Holmberg
Ericsson Finland



"Shankara, Udaya" wrote:

> Hi All,
>   Section 4 in RFC 3263 says the following:
>
> " Because the ACK request for 2xx responses to INVITE constitutes a
>    different transaction, there is no requirement that it be delivered
>    to the same server that received the original request (indeed, if
>    that server did not record-route, it will not get the ACK). "
>
> If the ACK is for a non-2xx response, is it necessary that it be delivered
> to the same server (I mean, host+port with same transport) to which INVITE
> was delivered, or is it sufficient to deliver the ACK to the same host? What
> about CANCEL?
>
> Regards,
> Udaya
> Intel Corporation
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