I have two computers and both have CUCP 8.0.2 installed. On one computer both soft phone and desk phone works fine. On another computer, both soft phone and desk phone are not working. Since I log in with the same user name, I guess my CUPS setings should be good.
The error I received on the non working PC is "A phone initilazation error has occurred. Failed to get configuration. ."
I was able to fix this same issue with the following fix.
CUCM - 8.51
CUPC - 8.51
Win 7 64bit
Call & Call with Video where both grayed out
In the Help/Show Server Health menu options the Call Control section was missing
In the Help/Show Server Health menu and click on the Notifications has the error
A Phone Initilation Error has Occurred. Failed to get configuration. 
After making sure all configuration was correct with the CTI users I found that the Windows Firewall was at fault
Goto Control Panel/Windows Firewall - click the "Allow a program or feature through Windows Firewall". Be sure to take note at which network you are connected to (Domain network, Home or work, public). before you go to the allow programs or features section. Make sure the check box to the left of CUPC & Cisco Unified Client Services Framework is checked and that the check box under the network you are connected to is checked to the right of the CSF.
Click OK and close the firewall window.
In CUPC click FILE/EXIT (don't just click the X to close the window this does not EXIT CUPC)
OPEN CUPC - give CUPC time to register
If this fixes your problem then your CALL menu option should NOT be grayed out and your should have a PHONE section in your server health.
I have a 9 part video series on configuring CUCM/CUPC & AD at the follow address
2012-02-28 12:55:55,357 WARN [provider-runner] [ConfigService] [TFTPConfigReader.getBackupFileFromCurrentFile(387)] - No existing file to back up C:\Users\hamed.adel\AppData\Local\Cisco\Unified Communications\Client Services Framework\Config\CSFUSER3.cnf.xml
2012-02-28 12:55:55,358 INFO [provider-runner] [ConfigService] [TFTPConfigReader.getFile(175)] - Requesting [CSFUSER3.cnf.xml] from [126.96.36.199] to [C:\Users\hamed.adel\AppData\Local\Cisco\Unified Communications\Client Services Framework\Config\CSFUSER3.cnf.xml]
i tested this command and it didn't work the tftp it give me timeout.
as i mentioned i disabled the firewall, also i forget to said that i have cisco ip communicator on same pc and it is working good and get its configuration which mean there is no problem with connection.
also is there any way to download the .cnf.xml file without using tftp (http or https)?, also how i could be sure that the files exist (for example list them using shell command or anything else)?.
also it may be server side as it happen with me at all pcs, and networks.
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