That figure includes the value of consumer services--about 62 percent of total revenues at $45.3 billion--and business buying of managed phone services, hosted equivalents, SIP trunking services and unified communications services and software, according to IHS Technology estimates.
“The competitive landscape has become highly fragmented for VoIP business services, with an increasing number of PBX and unified communications (UC) vendors, enterprise agents and resellers expanding into the market along with traditional service providers,” said Diane Myers, senior research director, VoIP, UC and IMS, IHS Technology.
Of the roughly $27.7 billion in business IP telephony spending, about $9 billion is generated by purchases of SIP trunking services (access).
Managed IP PBX services amounted to about $10 billion globally, while another $9 billion worth of hosted PBX services are sold as well.
Roughly 10 to 20 percent of new IP PBX lines sold are part of a managed service or outsourced contract depending on region, Myers said. Annual sales of business phone systems might have amounted to $6.4 billion in 2015, extrapolating from second quarter 2015 sales estimates.
As a result, managed IP PBX services, including private cloud services, are expected to comprise the largest segment of business VoIP services over the next several years.
There were 230 million residential VoIP subscribers worldwide in 2015, an increase of 3 percent from 2014
In 2015, unified communications-as-a-service (UCaaS) revenue grew six percent over the prior year and seats sold grew 25 percent.