CREATE TABLE conversation (
	conversation_no numeric(5) NOT NULL,
	active character(1),
	caller_from numeric(4),
	caller_to numeric(4),
	ivi_no numeric(4),
	class numeric(2),
	talk_day character(7),
	time_start numeric(6),
	time_stop numeric(6),
	trim_start numeric(6),
	trim_stop numeric(6),
	remarks character(240)
);