Unified Communications as a Service. Unified Communications delivered through a cloud-based model. Companies using a UCaaS service rely on a third-party provider to deliver tools like voice, video, chat, fax, and email over an IP network.
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Unified communications as a service (UCaaS) is a category of "as a service" or "cloud" delivery mechanisms for enterprise communications. Similar to platform as a service (PaaS, where data center capacity is made available to an enterprise on a consumption model from a service provider), with UCaaS, unified communications services can be made available from the cloud to businesses from SMB to enterprise.
UCaaS is part of a global industry trend towards cloud services, also known as digital transformation.