[SIPForum-discussion] why not ACK ???????????????????

Anthony Orlando avorlando at yahoo.com
Fri Nov 23 11:54:27 UTC 2007

There are other forms of ACK's called a PRACK that act
in the same manor.  The idea behind the ACK is that
you want reliable delivery of the SDP.  So you ACK the
200 OK.  SDP is usually contained in the 200 OK.  In
some cases SDP is delivered in a 18x. If you receive a
18x with SDP you should require a PRACK to the 18x. 
Hope this helps.

--- darshan b n <bn.darshan at gmail.com> wrote:

> Hi all,
> > "Why ACK is not send for messages otherthan INVITE
> transaction ??????????
> >
> please reply
> -- 
> Darshan B N
> Thanks & Regards
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