You need to pair devices when powering up CK3x00 for the first time or after resetting your handsfree. Subsequently, all connections between your phone and CK3x00 are automatically established when both devices are within a few meters range of each other. A 'beep' is played when the connection is established.
Procedure
From your phone, press MENU, select CONNECTIVITY, BLUETOOTH (turn ON).
Select SEARCH FOR AUDIO ENHANCEMENTS, press NEW (searching...).