TOKYO, August 30, 2011 - NTT Communications Corporation (NTT Com) announced on August 30 that its Arcstar (TM) Unified Communications Services will introduce the UCaaS (Unified Communications as a Service) Plan to allow Arcstar (TM) Global IP-VPN customers to utilize multiple communication functions according to their situation and needs on a flexible cloud-basis. The new service will be gradually rolled out globally beginning August 31. At the same time, NTT Com will expand coverage of its SIP Trunking Plan, a high-quality, low-rate external dialing service initially released in Singapore this May, to 15 countries including Australia and the UK, and to around 30 countries by March 2012.