NEW YORK, Jan. 2, 2014 /PRNewswire/ -- Persistent problems with the quality of mobile voice calls continue to negatively affect customer attitudes toward their network operator, which ultimately will require operators to invest in better-performing technologies like voice over Long Term...
Source : http://www.prnewswire.com/news-releases/voice-qual...
Source : http://www.prnewswire.com/news-releases/voice-qual...