Lync 2010 Limited Functionality error

This issue i have faced 3 or 4 times.But i haven't seen solution anywher in the net.First it took more time to identify the issu.So i thought this may help people like me.

First you verify the databse status from Backend sql managemnet studio.
Status of rtc and rtcdyn databse.This problem because of inconsistencies in rtcdyn databse.
If the problem started after Lync CU4 update then run the second command mentioned in lync kb article to restore the rtcdyn databse.Mostly this will resolve the issue.

Still You are facing the issue and you are not seing any ubnormalities in the databses please verify the permission of rtcdyn database.RTCUniversalservice shoud have read write permission on rtcdyn database

Last option is to stop all front end services.Login to Backend server,drop the rtcdyn database and create the database using install-csdatabase -update command from the lync fronend server.

Hope this will help you.Any updates please comment.............

Prepare Lync Schema Using command

Use the Install-CsAdServerSchema cmdlet to extend the Active Directory schema. After schema preparation is complete, manually verify that the schema partition has been replicated before proceeding to forest preparation.

To use cmdlets to prepare the schema of the current forest

1. Log on to a computer in the forest as a member of the Schema Admins group and with administrator rights on the schema master.
2. Install Lync Server Core components as follows:
   
   1. From the Lync Server 2010 installation folder or media, run Setup.exe to start the Lync Server Deployment Wizard.
   2. If you are prompted to install the Microsoft Visual C++ Redistributable, click Yes.
   3. The Microsoft Lync Server 2010 Setup dialog box prompts you for a location to install the Lync Server 2010 files. Choose the default location or Browse to a location of your choice, and then click Install.
   4. On the License Agreement page, check I accept the terms in the license agreement, and then click OK. The installer installs the Lync Server 2010 Core Components.
3. Start the Lync Server Management Shell: Click Start, click All Programs, click Microsoft Lync Server 2010, and then click Lync Server Management Shell.