Exchange UM call transfer and call forward.

Hello all,
Looking for some ideas with an issue with Exchange UM call transfer and Lync call forward.
Environment details:
Lync Server 2013 Enterprise Edition
Exchange 2010 UM
AudioCodes M3K with PRI connectivity.
Here are the scenarios:
Scenario 1:
Call comes in via PSTN to Exchange Auto Attendant.
Caller enters user extension
Exchange Calls User
User has Lync Client forwarded to mobile cell phone.
User's Mobile cell phone will ring but user does not answer.
After about 3 rings, Exchange will interrupt the transfer and say "Sorry, I cannot transfer you to that extension"
On the Exchange UM server event log, we see the following event: "
An error occurred while transferring a call to
[email protected]. Additional information: The call transfer type is "Blind.", the transfer target is "phone number", and the caller ID is: "a12b63b6-0da0-424d-87b1-b11bde4685ca".
The VoIP platform encountered an exception Microsoft.Rtc.Signaling.OperationFailureException: Failed to transfer, successful refer notification not received
   at Microsoft.Rtc.Signaling.SipAsyncResult`1.ThrowIfFailed()
   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncResult result)
   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncResult result, String operationId)
   at Microsoft.Rtc.Collaboration.Call.EndTransferCore(IAsyncResult result)
   at Microsoft.Rtc.Collaboration.AudioVideo.AudioVideoCall.EndTransfer(IAsyncResult result)
   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.BlindTransferSessionState.Call_TransferCompleted(IAsyncResult r)
   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.SubscriptionHelper.<>c__DisplayClass5f`1.<>c__DisplayClass62.<WrapCallback>b__5e()
   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.<>c__DisplayClassd.<CatchAndFireOnError>b__9()
   Detected at System.Environment.get_StackTrace()
   at Microsoft.Rtc.Signaling.OperationFailureException..ctor(String message)
   at Microsoft.Rtc.Collaboration.Call.CallTransferAsyncResult.Refer_StateChanged(Object sender, ReferStateChangedEventArgs e)
   at Microsoft.Rtc.Signaling.ReferStateChangedEventArgs.Microsoft.Rtc.Signaling.IWorkitem.Process()
   at Microsoft.Rtc.Signaling.WorkitemQueue.ProcessItems()
   at Microsoft.Rtc.Signaling.SerializationQueue`1.ResumeProcessing()
   at Microsoft.Rtc.Signaling.SerializationQueue`1.ResumeProcessingCallback(Object state)
   at Microsoft.Rtc.Signaling.QueueWorkItemState.ExecuteWrappedMethod(WaitCallback method, Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.ExecuteCodeWithGuaranteedCleanup(TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallbackInternal(_ThreadPoolWaitCallback tpWaitCallBack)
   at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback(Object state)
FailureReason = 0 during the call with ID "a12b63b6-0da0-424d-87b1-b11bde4685ca". This exception occurred at the Microsoft Exchange Speech Engine VoIP platform during an event-based asynchronous operation submitted by the Unified Messaging server.
The Unified Messaging server will attempt to recover from this exception. If this warning occurs frequently, contact Microsoft Product Support.
Scenario 2:
Call comes in via PSTN to Exchange Auto Attendant.
Caller enters user extension
Exchange Calls User
User has Lync Client forwarded to mobile cell phone.
User's Mobile cell phone will ring but user presses ignore on cell phone
Once ignore is pressed, cell phone voicemail will pickup so Exchange will complete the transfer.
I'm don't believe Exchange UM has a no-answer timeout setting for call transfer and i'm not sure if a setting on the gateway can resolve the issue. Any ideas on how to resolve scenario 1?
Thanks,
Prashanth

Can you confirm that you haven't enabled voicemail escape?
Voicemail escape is set to 15 seconds by default if enabled and not specified.
Please remember, if you see a post that helped you please click "Vote As Helpful" and if it answered your question, please click "Mark As Answer"
Lync Sorted blog

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