Hi Tom,

I am getting below error during establish the user endpoint using UCMA5 SDK library.

DetectionStackTrace

at System.Environment.GetStackTrace(Exception e, Boolean needFileInfo)
at System.Environment.get_StackTrace()
at Microsoft.Rtc.Signaling.FailureResponseException..ctor(String message, Exception innerException, SipResponseData responseData)
at Microsoft.Rtc.Signaling.Helper.CreateExceptionByType(String message, SipResponseData responseData, Exception innerException, Type exceptionType)
at Microsoft.Rtc.Signaling.SipTransactionAsyncResult1.CheckForTooManyTransactions() at Microsoft.Rtc.Signaling.SipTransactionAsyncResult1.ProcessCore()
at Microsoft.Rtc.Signaling.SipTransactionAsyncResult1.ProcessAuthenticationRequiredResponse(SipResponse response) at Microsoft.Rtc.Signaling.SipTransactionAsyncResult1.Transaction_ResponseReceived(Object sender, ResponseReceivedEventArgs e)
at Microsoft.Rtc.Internal.Sip.SingleThreadedDispatcherQueue.DispatcherCallback(Object queue)
at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
at System.Threading.ThreadPoolWorkQueue.Dispatch()

Stack Trace

at Microsoft.Rtc.Signaling.SipAsyncResult`1.ThrowIfFailed()
at Microsoft.Rtc.Signaling.Helper.EndAsyncOperation[T](Object owner, IAsyncResult result)
at Microsoft.Rtc.Collaboration.LocalEndpoint.EndEstablish(IAsyncResult result)
at Microsoft.Rtc.Collaboration.UCMASampleHelper.EndEndpointEstablish(IAsyncResult ar) in D:\InstantMessagingCall\UCMASampleHelper.cs:line 735

Message

The operation failed after several attempts.

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