> 1. what happens if 200 Ok for PRACK doesn"t recieve.call droped or not?
I think, Yes. As PRACK is like any other request within a dialog, it will be
retransmitted and UAC should terminate the dialog on timeout.
3261, Section 12.2.1.2:
If the response for a request within a dialog is a 481 (Call/Transaction Does
Not Exist) or a 408 (Request Timeout), the UAC SHOULD terminate the dialog. A
UAC SHOULD also terminate a dialog if no response at all is received for the
request (the client transaction would inform the TU about the timeout.)
For INVITE initiated dialogs, terminating the dialog consists of sending a BYE.
-Ramakrishna
________________________________
From: [EMAIL PROTECTED] on behalf of Paul Kyzivat
Sent: Fri 9/30/2005 8:11 PM
To: jay prakash dubey
Cc: Sip-Implementors
Subject: Re: [Sip-implementors] Query regarding 183 provisional response.
jay prakash dubey wrote:
>
> Hi all,
>
> I am having one basic doubt in Prvisional response.If 180 ringing and 183
> session progress both came from UAS to UAC.
>
> -----------INVITE+SDP------------------->
> <----------183 Session progress(SDP)---------
> ------------PRACK----------------------->
> <------------180 Ringing(SDP)----------------
> <------------200 Ok (for PRACK)---------------
> <------------200 Ok (for INVITE)--------------
> -------------------- --------------ACK( for Invite)---------->
>
> 1. what happen if 200 Ok for PRACK doesn"t recieve.call droped or not?
I don't know.
> 2. if 183 and 180 both has SDP than when final SDP negotiation can be done in
> 200 OK (PRACK)?
Because PRACKs are being used, the first reliable response with SDP (the
183) completed the initial offer/answer. The SDP in the 180 is
erroneous, because it can't be an answer, and it isn't a valid place to
send an offer.
If you correct the flow, by removing the SDP from the 180, then there
really shouldn't be SDP in the 200. It is however permitted according to
3261. If present, it must be the same as what was in the earlier answer.
Paul
> can any body clarify this call flow as in my application Early media is
> must....
>
> Thanks and regards
> Jay
>
>
>
>
>
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>
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