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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