You may experience a dialing rules problem after you uninstall Windows Server 2003 Service Pack 1 from a Windows Server 2003-based computer

After you uninstall Microsoft Windows Server 2003 Service Pack 1 (SP1) from a Windows Server 2003-based computer, you may experience a dialing rules problem. You may no longer be able to select a location in the country/region list in the Phone and Modem Options dialog box. Additionally, some applications that require dialing rules may not function correctly.

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To restore the dialing rules data to the the way they were in the original release version of Windows Server 2003, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then click OK.
2. In Registry Editor, locate and then click following registry subkey:
   HKEY_LOCAL_MACHINE\software\Microsoft\windows\Currentversion\Telephony\Country List
3. Double-click the CountryListVersion registry entry.
4. In the Value data box, type 0, and then click OK.
5. Stop the Telephony service by using one of the following methods:
   • Use the Microsoft Management Console (MMC) Services snap-in:
     1. Click Start, click Run, type services.msc in the Open box, and then click OK.
     2. In the Services dialog box, in the list of services, double-click the Telephony service.
     3. Click the General tab.
     4. Under Service status, click Stop.
   • Use the net stop tapisrv command:
     1. Click Start, click Run, type net stop tapisrv in the Open box, and then click OK.
     2. Type N when you are prompted, and then press ENTER.
   • Restart the computer.

The next time that you open the Phone and Modem Options dialog box, you will find that the registry is updated. The registry will have the dialing rules data from the original release version of Windows Server 2003.

Note For any custom modifications to take effect, repeat your earlier custom modifications under the subkey. Then, restart the Telephony service.

Microsoft has confirmed that this is a problem in Windows Server 2003.