Over-the-top (OTT) is networking lingo that describes the delivery of content, services or applications over the internet. OTT edge providers typically deliver their content and services to customers on top of network infrastructure that is owned and maintained by internet service providers (ISPs), like Verizon and AT&T.
A session border controller (SBC) is a dedicated hardware device or software application that governs the manner in which phone calls are initiated, conducted and terminated on a Voice over Internet Protocol (VoIP) network. Phone calls are referred to as sessions.
Telecommunications is the transmission of data, voice and video over significant distances by electronic means that use a wide variety of networks and media.