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A DTMF-based IVR application that is developed by using Lync Server 2010, UCMA 3.0 Workflow APIs crashes

SYMPTOMS
Consider the following scenario:
  • You deploy a dual tone multi-frequency (DTMF) based Interactive Voice Response (IVR) application. The application is developed by using Microsoft Lync Server 2010, Unified Communications Managed API 3.0 (UCMA3.0) Workflow Speech controls. 
  • The application contains a SpeechQuestionAnswerActivity and an associated ConsecutiveNoInputsSpeechEventActivity, ConsecutiveNoRecognitionsSpeechEventActivity, SpeechHelpCommandActivity, or SpeechRepeatCommandActivity. These event or command activities contain a StatementActivity or SpeechQuestionAnswerActivity.
  • A user connects to the application, and then the user starts pressing DTMF digits while a question message plays back.
  • The application stops playing the question message and stays silent, and then the user disconnects.
In this scenario, the UCMA 3.0 workflow IVR application crashes. Additionally, you receive the following error message:

System.NullReferenceException was unhandled
Message=Object reference not set to an instance of an object.
Source=System.Workflow.ComponentModel

CAUSE
This issue occurs because an event or command activity is initiated before the question message has completed playing. Then, internal events occur out of order and cause an unhandled runtime exception in the Windows workflow platform.
RESOLUTION
To resolve this issue, install the following update.

The following files are available for download from the Microsoft Download Center:
DownloadDownload the UcmaWorkflowRuntime.msp package now.

Release Date: April 2012

For more information about how to download Microsoft support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to obtain Microsoft support files from online services
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Properties

Article ID: 2568557 - Last Review: 04/09/2012 09:39:00 - Revision: 3.0

Microsoft Unified Communications Managed API v3.0 Software Development Kit, Microsoft Lync Server 2010 Standard Edition, Microsoft Lync Server 2010 Enterprise Edition

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