Some stats on VoIP from ANPI.
By the end of 2015, “60% of all North American enterprises will move at least 30% of their voice communication to the cloud” — Gartner.
The IP Voice services market is currently growing at a 28.8% compound annual growth rate — Gartner
The current communications market for businesses with less than 100 lines is $15 BILLION
$377 BILLION will be spent on VoIP, Unified Communications, and other hosted services over the next 5 years.
$30 Billion US Telecommunications Private Line Services Market Starts To Decline, says Insight Research Corp.
Global UCaaS Market Revenue Is Expected To Grow To $75.81 Billion In 2020: New Report By Grand View Research [Or some big number that no one will hold us to.] "On premise unified communication accounted for over 60% of the market in 2013.
Global (UC) Unified Communication Market 2015-2019 report says one of the key trends in this industry is the increasing adoption of hosted UC. Mobility helps enterprises establish connections with businesses, workplace, and customers without time and location constraints. Analysts forecast the Global Unified Communication (UC) market to grow at a CAGR of 14.08% over the period 2014-2019.
New Wainhouse Research Study Forecasts Unified Communications as a Service (UCaaS) Market to Grow to $5.3B by 2018. In fact, the worldwide UCaaS market is forecast to be approximately $5.3B by 2018 with a 5-year compound annual growth rate of 24%, with considerable growth coming from the mid-to-large enterprise segment." [source]