You cannot prevent Office Communicator 2007 from controlling the call forwarding settings. In some scenarios, Office Communicator 2007 will overwrite the Private Branch Exchange (PBX) forwarding settings. This causes you to lose some important calls.
To resolve this problem, you must first install the update that is described in Microsoft Knowledge Base article 957465. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
957465 Description of the Communicator 2007 hotfix rollup package: December 19, 2008
Then you must enable the new policy that this update provides. This policy disables the call forwarding settings from Office Communicator for a Remote Call Control user. After this policy is applied, Office Communicator no longer controls forwarding settings on the PBX.
To have us enable this policy for you, go to the “Fix it for me” section after you have installed the update. If you would rather enable this policy yourself, go to the “Let me fix it myself” section after you have installed the update.
Fix it for me
To enable the policy automatically, click the Fix this problem link. Then click Run in the File Download dialog box, and follow the steps in this wizard.
Note This wizard may be in English only; however, the automatic fix also works for other language versions of Windows.
Note If you are not on the computer that has the problem, you can save the automatic fix to a flash drive or to a CD, and then you can run it on the computer that has the problem.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows
To enable this policy yourself, follow these steps:
Click Start, click Run, type regedit, and then click OK.
Locate and then click the following registry subkey: