Over the Top - OTT
Over the Top (OTT) messages are messages that flow through the data network of a Mobile Operator as opposed to the core network as traditionally was the case. Over the Top suggests something that flows over the top of the core network. By way of example, a P2P SMS message travels through the core signalling infrastructure of a Mobile Operator, where a WhatsApp message will flow through the data connection of a mobile operator (just like any other data). In this context a WhatsApp message is regarded as an OTT message.
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