code: def ClearCallHistory(self, Username='ALL', Type=chsAllCalls):
          
          cmd = 'CLEAR CALLHISTORY %s %s' % (str(Type), Username)
          self._DoCommand(cmd, cmd)
docs: Clears the call history.
  
          :Parameters:
            Username : str
              Skypename of the user. A special value of 'ALL' means that entries of all users should
              be removed.
            Type : `enums`.clt*
              Call type.