TOKYO, May 30, 2011 /PRNewswire/ -- NTT Communications Corporation (NTT Com) announced on May 30 that its Arcstar(TM) Unified Communications Services will introduce the SIP Trunking Plan to allow Arcstar(TM) Global IP-VPN users to dial external lines for high-quality, low-rate voice communications w
Source : http://www.prnewswire.com/news-releases/ntt-com-to...
Source : http://www.prnewswire.com/news-releases/ntt-com-to...