Subject: [Sip] QoS parameters in SDP as per RFC 3312

From: "Allen Paul" <[email-masked]>
Date: Tue, 7 Mar 2006 10:09:24 +0530

Hi,

   We are implementing a one way video streaming application with
QoS.Whatshould be the qos parameters in SDP for a streaming
application(Video is
send from offerer to answerer),different implementation seems to be behaving
different ways for qos negotiation.Would like to know which of the following
call flow is valid

Flow 1
  INVITE
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos none remote send
  183
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local recv
     a=des:qos mandatory remote recv
     a=conf:qos remote recv
 PRACK
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos mandatory remote send
200 OK for PRACK
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local recv
     a=des:qos mandatory remote recv
     a=conf:qos remote recv
UPDATE
      a=curr:qos local send
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos mandatory remote send
200 OK UPDATE
     a=curr:qos local recv
     a=curr:qos remote recv
     a=des:qos mandatory local recv
     a=des:qos mandatory remote recv

Flow 2

  INVITE
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos mandatory remote recv
  183
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local recv
     a=des:qos mandatory remote send
     a=conf:qos remote send
 PRACK
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos mandatory remote recv
200 OK for PRACK
     a=curr:qos local none
     a=curr:qos remote none
     a=des:qos mandatory local recv
     a=des:qos mandatory remote send
     a=conf:qos remote send
UPDATE
      a=curr:qos local sendrecv
     a=curr:qos remote none
     a=des:qos mandatory local send
     a=des:qos mandatory remote recv
200 OK UPDATE
     a=curr:qos local sendrecv
     a=curr:qos remote sendrecv
     a=des:qos mandatory local recv
     a=des:qos mandatory remote send

Regards
Allen
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