UCMA : Error while receiving a Audio Video conference

Hi  ,

I am getting error while answering a incoming conference call .

I am able to answer the conference if i call manually adding each user endpoint using "Invite More People" .

I have a automated code which can initiate a conference,  When i try to call all the userEndpoints at a time i get the below error , and it starts at the second client who receives the conference invitation .

   at Microsoft.Rtc.Collaboration.Sample.BasicConferencing.ConferencingSampleSL.
AvCall_EstablishCompleted(IAsyncResult result) in C:\Samples\\BasicConferencing\ConferenceSampleSL.cs:line 184
Detected at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
   at System.Environment.get_StackTrace()
   at Microsoft.Rtc.Signaling.RealTimeException..ctor(String message, ExceptioninnerException)
   at Microsoft.Rtc.Collaboration.Conversation.RequestNegotiationTriggerOperationCompleted(IAsyncResult result)
   at Microsoft.Rtc.Signaling.SipAsyncResult`1.MakeCallback(Object state)
   at Microsoft.Rtc.Signaling.QueueWorkItemState.ExecuteWrappedMethod(WaitCallback method, Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
FailureReason = Unknown

Can some one help me in this please .

Thanks in advance .

Regards,

SrinivasLolla

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Regards, SL