No Ringback tone heard on OCS client after getting 180 RInging followed by RTP packets from Remote endpoint.

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  My call scenario is as below:

  My Endpoint                                         MS                                           OCS Clinet

                          <............INVITE.........         <............INVITE.........

                          ............180 Ringing.......>      ............180 Ringing.......>

                           ======RTP Packts===>  ======RTP Packts=====> *** No Ringback heard.

  After recieving INVITE at my IP endpoint, it sends 180 and then immediately RTP packets(No 183/200 OK). In this scenario on OCS Clients I'm not hearing Ringback tone.

  I heard this is valid behaviour but I don't how to get this kind of information from Microsft. I was searching through OC Help pages but I didn't get this. Is this valid behaviour? Is there any document/site avialable to check these kind of behaviours in future.

  Can someone please answer this?

  Thanks,
  Bharath

  Tuesday, June 16, 2009 5:20 AM