[SIPForum-discussion] why not ACK ???????????????????
alexzhang at gdnt.com.cn
alexzhang at gdnt.com.cn
Fri Nov 23 13:29:52 UTC 2007
Of cource, there could be SDP Parm in the PRACK message to initiate the
2nd Offer/Answer for codec re-negotiation.
________________________________
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of darshan b n
Sent: Friday, November 23, 2007 8:07 PM
To: Anthony Orlando
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] why not ACK ???????????????????
Hi,
I want to know it is possible to Send an SDP parameter in PRACK similar
to What an ACK message does in a SIP seesion?
Regards
Darshan B N
On 23/11/2007, Anthony Orlando <avorlando at yahoo.com> wrote:
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.
Anthony
--- 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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--
Darshan B N
Thanks & Regards
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