Singapore Telecommunications announced on Tuesday that it has closed the order book for its US$500 million 10-year notes after they were 2.5 times oversubscribed, receiving an interest of approximately US$1.25 billion from investors. The Notes, which were issued by subsidiary Singtel Group Treasury , will carry a coupon of 3.25 per cent per annum and are drawn down under SGT's $10 billion Euro Medium Term Note Programme guaranteed by Singtel.