Interactive calls over a data modem by a TAPI3 application do not work as expected (304909)


The information in this article applies to:

  • Microsoft Windows 2000 Server SP1
  • Microsoft Windows 2000 Server SP2
  • Microsoft Windows 2000 Advanced Server SP1
  • Microsoft Windows 2000 Advanced Server SP2
  • Microsoft Windows 2000 Professional SP1
  • Microsoft Windows 2000 Professional SP2
This article was previously published under Q304909

SYMPTOMS

When a TAPI3 application tries to make an interactive call over a data modem, the operation may not be successful. Specifically, the call may remain stuck in an "in progress" state. No dialog box is ever displayed.

CAUSE

This issue occurs if the Unimodem driver lacks the code to display the Talk/Drop dialog box when an interactive voice call is made over a data modem.

RESOLUTION

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, Microsoft recommends that you wait for the next Microsoft Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. 
   Date         Time   Version            Size    File name
   ---------------------------------------------------------
   24-Aug-2001  05:05  5.0.2195.4233     375,568  Tapi3.dll        
   24-Aug-2001  05:05  5.0.2195.3794     201,488  Unimdm.tsp

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.

MORE INFORMATION

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the following article number to view the article in the Microsoft Knowledge Base:

265173 The Datacenter program and Windows 2000 Datacenter Server product

For additional information about how to install multiple hotfixes with only one restart, click the following article number to view the article in the Microsoft Knowledge Base:

296861 How to install multiple Windows updates or hotfixes with only one reboot

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the following article number to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 hotfixes

Modification Type:MinorLast Reviewed:10/7/2005
Keywords:kbHotfixServer kbQFE kbbug kbfix kbnetwork kbQFE kbWin2000PreSP3Fix kbWin2000sp3fix KB304909 kbAudITPRO kbAudDeveloper
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