Hi Mahesh,
Check out the values of "C-Seq" and "Branch parameter of Via field"
of the ACK Request. ACK to a 200 OK response will be treated as a
new transaction and hence it should contain a different value for the
"Branch parameter of Via field" than the one used in sending INVITE.
Also check that the ACK request has the same value for C-Seq number
as used in INVITE since ACK and CANCEL are exceptional SIP requests
which carry the same value for C-Seq that is used by the concerned
previous
SIP Request.
---
Rgds
Nagaraj S
----- Original Message -----
From: mahesh akarapu <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, November 30, 2004 11:19 AM
Subject: RE: [Sip-implementors] 200 OK after recieving ACK
> Hi Pankaj,
>
> Thanks for the response. But I am afraid your response does not answer
> my question. There are no RE-INVITE or BYE messages between ACK and the
> 200 OK. Immediately after an ACK is recieved, a 200 OK is sent. I doubt
> that there may be something missing in ACK because of which the UA is
> not accepting the ACK and hence sending the 200 OK. But i am not sure on
> that.
>
> Regards
> Mahesh
>
>
>
> On Tue, 2004-11-30 at 11:01, [EMAIL PROTECTED] wrote:
> >
> > Hi Mahesh,
> >
> > As RFC 3261 mentions, the case wherein a 200 OK is sent after an ACK can
> > be in response to a RE-INVITE sent from either party. The other case can
> > be a response to a BYE message.
> >
> > Hope it answers your question.
> >
> > Thanks,
> > Pankaj.
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED] On Behalf Of mahesh
> > akarapu
> > Sent: Tuesday, November 30, 2004 10:48 AM
> > To: [EMAIL PROTECTED]
> > Subject: [Sip-implementors] 200 OK after recieving ACK
> >
> > Hi all,
> > I have a doubt regarding how ACK requests are handled.
> > I am trying to establish a SIP session. The following is the scenario.
> > A------------B
> > INV--------->
> > <----------100
> > <----------180
> > <----------200
> > ACK--------->
> > Till this point, it is OK.But after this there are repeated 200Ok from B
> > as below.
> > <----------200
> > ACK--------->
> > <----------200
> > ACK--------->
> >
> > I guess according to the RFC 3261, once ACK is received, the UA should
> > stop sending the 200 OK.Could someone please tell me if this a possible
> > scenario, that is under what circumstances 200 OK is sent after
> > recieving ACK. I could not get the answer for this from the RFC.
> >
> > Could someone answer this.
> >
> > thanks
> > Mahesh
> >
> >
> >
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> >
> >
> >
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