[SIPForum-discussion] Why ACK is separate transaction for INVITE

[sunitha r]

Hi *Bihari Lal Gupta,*

In Sip, 2XX will be the final response for INVITE. So from INVITE to 2XX  is
one completee transaction and after 2XX response whatever comes it will be
considered as a separate transaction.

Thank you and Regards,
Sunitha.R



On Thu, Jun 16, 2011 at 12:11 AM, biharilal gupta <guptabihari at yahoo.com>wrote:

>   Hi,
>
> Can anyone pls tell me why ACK is a separate transaction in case of 2xx
> (Final response) of INVITE request, and why ACK is not considered a separate
> transaction in case of 486 busy response of INVITE.
>
> Thanks & Regards,
> *Bihari Lal Gupta*
>
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