Hi,

Having some issue on system when ringing through to the microsoft auto attendant setting, if the system doesn't have a call come through it for a few minutes it will be slow to answer the call and then when it does pickup it presents no message. Hang and call back straightaway and it works perfectly. Leave for a few minutes and back to square one. The error message on the exchange box is detailed below.

I would appreciate any advice on this as we've not had an issue like this present itself before and from what we can see the config is correct and the right language packages are installed as it does work but something somewhere is timing out on first try.

Log Name:      Application

Source:        MSExchange Unified Messaging

Date:          06/07/2015 17:12:24

Event ID:      1079

Task Category: UMCore

Level:         Warning

Keywords:      Classic

User:          N/A

Computer:      mailserver

Description:

The VoIP platform encountered an exception Microsoft.Rtc.Signaling.OperationTimeoutException:This operation has timed out.

   at Microsoft.Rtc.Signaling.SipAsyncResult`1.ThrowIfFailed()

   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncResult result)

   at Microsoft.Rtc.Collaboration.Call.EndAcceptCore(IAsyncResult result)

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.AcceptCallSessionState.Call_AcceptCompleted(IAsyncResult r)

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.SubscriptionHelper.<>c__DisplayClass67`1.<>c__DisplayClass6a.<WrapCallback>b__66()

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.<>c__DisplayClassf.<CatchAndFireOnError>b__b()

Detected at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)

   at System.Environment.get_StackTrace()

   at Microsoft.Rtc.Signaling.SipAcceptAsyncResult.TimerItem_Expired(Object sender, EventArgs e)

   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() during the call with ID "b0af5cb9-1c79-4140-99e9-4308e6905dcc". This exception occurred at the Microsoft Exchange Speech Engine VoIP platform during an event-based asynchronous operation submitted by the server. The server will attempt to recover from this exception. If this warning occurs frequently, contact Microsoft Product Support.

Event Xml:

<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">

  <System>

    <Provider Name="MSExchange Unified Messaging" />

    <EventID Qualifiers="32772">1079</EventID>

    <Level>3</Level>

    <Task>2</Task>

    <Keywords>0x80000000000000</Keywords>

    <TimeCreated SystemTime="2015-07-06T16:12:24.000000000Z" />

    <EventRecordID>4552123</EventRecordID>

    <Channel>Application</Channel>

    <Computer>Mailserver

</Computer>

    <Security />

  </System>

  <EventData>

    <Data>Microsoft.Rtc.Signaling.OperationTimeoutException:This operation has timed out.

   at Microsoft.Rtc.Signaling.SipAsyncResult`1.ThrowIfFailed()

   at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncResult result)

   at Microsoft.Rtc.Collaboration.Call.EndAcceptCore(IAsyncResult result)

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.AcceptCallSessionState.Call_AcceptCompleted(IAsyncResult r)

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.SubscriptionHelper.&lt;&gt;c__DisplayClass67`1.&lt;&gt;c__DisplayClass6a.&lt;WrapCallback&gt;b__66()

   at Microsoft.Exchange.UM.UcmaPlatform.UcmaCallSession.&lt;&gt;c__DisplayClassf.&lt;CatchAndFireOnError&gt;b__b()

Detected at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)

   at System.Environment.get_StackTrace()

   at Microsoft.Rtc.Signaling.SipAcceptAsyncResult.TimerItem_Expired(Object sender, EventArgs e)

   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()</Data>

    <Data>b0af5cb9-1c79-4140-99e9-4308e6905dcc</Data>

  </EventData>

</Event>

 

Warning 06/07/2015 17:12:24 MSExchange Unified Messaging 1079 UMCore

• Edited by edgeofgrip Monday, July 06, 2015 8:40 PM

On what rollup is your exchange running ?

YOu can check your UM certificates to ensure they are not expired

Is this issue happening on all autoattendants ?

Try restarting the servers during the weekend and see the results ?


In most of these cases ReCreating  AA might be the final solution.

Good Luck