Unified Communications as a Service (UCaaS) is growing annually at a rate of nearly 30 percent and currently accounts for about 8 percent of all managed and hosted business voice subscribers, according to a report from Synergy Research Group. Leading the UCaaS space by revenue are 8x8, ShoreTel and RingCentral, which combined make up about 36 percent of the market. Leading the UCaaS space by subscribers is Fonality, Vocalocity and Mitel. Release