Inactivity Timeout not Passed Through to TAPI Service Provider

Setting "Disconnect a call if idle for more than xxx mins" on the on the Connection tab of the Modem Control Panel tool has no effect on idle timeout disconnect.

The registry appears to be properly updated, but the modem initialization string does not contain the proper timeout value.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

1. Start Registry Editor (Regedt32.exe).
2. Set the following entry to the desired value:
   
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class \{4D36E96D-E325-11CE-BFC1-08002BE10318}\0000\Settings\InactivityTimeo
   
   
   Where {4D36E96D-E325-11CE-BFC1-08002BE10318} is the general entry for modems and 0000 the number that specifies the modem you want to change the value for.
3. Quit Registry Editor and restart your computer.

Microsoft has confirmed this to be a problem in Windows NT version 4.0. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.