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

[Johnson Jagasetty]

Hi , 
Here is my understanding why ACK is separate transaction for INVITE.

When ever 200 response comes it will be sent to UAC. here UAC is responsible to acknowledge all 200 responses with ACK.
Since transaction layer (Once response has been received, the state will be changed to completed).doesn't care about re transmissions of ACK, Hence UAC has to take care of that and UAC will  handover the ACK to transport layer directly.
So in this context ACK must be a separate transaction.

Please correct me if I am wrong

Regards,
johnson


Date: Sat, 18 Jun 2011 18:54:48 +0530
From: deepu.sarmatian at gmail.com
To: sunitha.samiksha at gmail.com
CC: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Why ACK is separate transaction for INVITE

Hi Sunitha,   Exactly. Why is it so? You rephrased Bihari Lal Gupta's question. 

 2011/6/17 sunitha r <sunitha.samiksha at gmail.com>

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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