MSPL Retarget a Invite Request to UCMA ApplicationEndpoint But Accept Call Timeout

I retarget invite requests to an application endpoint, but failed because of the timeout while accepting the incoming call. The exception details are as follows:
Occured an error while accepting the call. Detail: Microsoft.Rtc.Signaling.Opera
tionTimeoutException:This operation has timed out.
   at Microsoft.Rtc.Signaling.SipAsyncResult`1.ThrowIfFailed()
   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncRe
sult result)
   at Microsoft.Rtc.Collaboration.Call.EndAcceptCore(IAsyncResult result)
   at IMTransfer.InstantMessageTransfer.<>c__DisplayClass1.<OnInstantMessagingCa
llReceived>b__0(IAsyncResult ar) in C:\Users\qhguo\documents\visual studio 2010\
Projects\UCMA Sample Code\IMTransfer\Program.cs:line 48
Detected at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
   at System.Environment.get_StackTrace()
   at Microsoft.Rtc.Signaling.RealTimeException..ctor(String message, Exception
innerException)
   at Microsoft.Rtc.Signaling.SipAcceptAsyncResult.TimerItem_Expired(Object send
er, EventArgs e)
   at Microsoft.Rtc.Signaling.QueueWorkItemState.ExecuteWrappedMethod(WaitCallba
ck method, Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, C
ontextCallback callback, Object state, Boolean ignoreSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWor
kItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()
The incomming call state has change from Terminating to Terminated
And the following pictures tell us the reslut of analyzing the log files:
Front-End Server: FEServer.bjdev.com/pool.bjdev.com
App Server: exchange.bjdev.com
I have been confirmed, all of the firewall have been closed. What could be the reason lead to accept incomming call timeout?

Hi IT漫步者,
Can you try disabling
REFER support in Lync Control Panel ?
Best regards,
Eric

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