Lync Server Front End Service Failed to Start

After installing Lync Front End server some times it wont start.Some time it will start and stop.
Some time it will give error like failed to start.Service code 1008193023
  
To resolve this problem, follow these steps to enable cross-database ownership chaining for the RTC database and for the RTCdyn database:

1. On a computer that is running Microsoft SQL Server, connect to the RTC database, and then run the following SQL command from SQL Server Management Studio:

   "sp_dboption rtc, 'db chaining', TRUE"

2. Connect to the RTCdyn database, and then run the following SQL command from SQL Server Management Studio:

   "sp_dboption rtcdyn,  'db chaining', TRUE"

3. Start the Front End services.

Ref:http://support.microsoft.com/kb/968100