With its Voice API, TENIOS operates an interface for voice services, which enables the integration of customer-specific voice applications via common web technologies (https, REST) into the cloud communications platform. The Voice API bundles a number of functions (in particular dynamic call control) that allow software applications to initiate and receive calls without application developers having to deal with telecommunications technologies and protocols. This controls the telephony via the Voice API and with it the processing and forwarding of incoming / outgoing calls.