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Nextiva Takes Huge Step Growing Sales Channel With Addition of Microsoft’s Former GM, Eric Martorano. UCaaS is a cloud delivery model that offers a variety of communication and collaboration applications and services, including providers such as RingCentral, Nextiva, 8x8 Inc., and Microsoft, to third-party cloud service providers, such as Verizon, AT&T, and BT. The rise of the phone and e-mail led to the need for unified communications.