def add_cti_file(self, file_path: str):
if not os.path.exists(file_path):<EOL><INDENT>self._logger.warning(<EOL>'<STR_LIT>'.format(file_path)<EOL>)<EOL><DEDENT>if file_path not in self._cti_files:<EOL><INDENT>self._cti_files.append(file_path)<EOL>self._logger.info(<EOL>'<STR_LIT>'.format(file_path)<EOL>)<EOL><DEDENT>
Adds a CTI file to work with to the CTI file list.

:param file_path: Set a file path to the target CTI file.

:return: None.