Changing Customer Data

When you make a modification to customer data via the vicidial agent interface such as Last Name or Address. Is this flagged anywhere in the database so you can determine what information has changed, or is just an UPDATE?
VICIDIAL astGUIclient discussion forum
http://www.vicidial.org/VICIDIALforum/
http://www.vicidial.org/VICIDIALforum/viewtopic.php?f=4&t=4704