When you log on to Microsoft Office Communicator 2007,
registry settings for certain protocols are overwritten. These protocols include the following protocols:
Additionally, Communicator 2007 becomes the default
application for these protocols.
This issue occurs because, when you log on to Communicator 2007,
the registry entries for these protocols point to the location
where Communicator 2007 is installed. Therefore, Communicator 2007 becomes the
default application for these protocols.
To resolve this issue, follow these
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:
How to back up and restore the registry in Windows
- Exit Communicator 2007.
- Install update 951662.
For more information, click the following article number to
view the article in the Microsoft Knowledge Base:
Description of the update for Communicator 2007: April 30, 2008
- Click Start, and then click
- Type regedit in the
Open box, and then click OK.
- Locate and then right-click the following registry subkey:
- Point to New, and then click DWORD
DisabledProtocolHandlerRegistrations as the name of the
new registry entry, and then press ENTER.
- In the
registry, enter the correct information for the application that you want. For example, to change the application for SIP from Communicator 2007
to the application that you want, follow these steps:
- Locate and then click the following registry subkey:
HKEY_CURRENT_USER\Software\Classes\sip\shell\open\commandNotice that the default value points to
- Double-click the Default registry
entry. Then, modify the value to reflect the application that you want to use
instead of Communicator 2007.
- Prevent Communicator 2007 from being rewritten to the
registry setting that you modified in step 8b. To do this, use the
values in the following list for the DisabledProtocolHandlerRegistrations
registry entry that you created:
When you enter the appropriate value for the protocol for which you want to use another application, Communicator 2007 will not be written to the registry
when you log on.
- TEL: 0x0001
- CALLTO: 0x0002
- SIP: 0x0004
- SIPS: 0x0008
- IM: 0x0010
- CONF: 0x0020
This registry entry
is a bitmask. Therefore, you can sum the values in the list if you want to
prevent Communicator 2007 from being the default application for multiple protocols.
For example, to prevent
Communicator 2007 from being the default application for SIP, enter
0x0004. To prevent
Communicator 2007 from being the default application for CALLTO, enter
0x0002. To prevent
Communicator 2007 from being the default application for both SIP and CALLTO, enter
Communicator 2007 from being the default application for all the
protocols, enter 3f.
Note These values can be changed only after you log off from Communicator
2007. If you change the value in the DisabledProtocolHandlerRegistrations
registry entry while you are logged on to Communicator 2007, there is no
- Log on to Communicator 2007. Verify that Communicator 2007 has
not overwritten the registry data for the protocols that you modified in the previous
For example, if you are using a different application for SIP, verify
that that application remains in the registry under the
following registry subkey:
Also, verify that the value in the
registry entry is correct. For example, the value for SIP should be
Article ID: 951868 - Last Review: April 30, 2008 - Revision: 1.1
- Microsoft Office Communicator 2007
|kboffice2007presp2fix kbtshoot kbexpertisebeginner kbprb KB951868|