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Communications as a Service (CaaS) is a particular instance of SaaS that includes hosted voice, videoconferencing, instant messaging, email, collaboration, and all other communication services that are hosted in the cloud. These outsourced corporate communication services can support on-premises or mobile users accessing the applications hosted in the cloud.

The CaaS model allows even small to medium-sized businesses to implement advanced technologies at a reasonable metered cost. There is no need for a staff to manage these communication services since the CaaS cloud provider takes responsibility. Another common term for this service is Unified Communications as a Service (UCaaS).