OTT

Over-the-Top (OTT) refers to communication services — voice calls, video calls, and messaging — delivered directly over the internet, bypassing the traditional carrier network for call routing. Popular examples include WhatsApp, Zoom, and Teams.

Unlike consumer OTT apps, carrier-grade VoIP solutions built on SIP integrate with the PSTN, support E.164 numbering, and offer service-level guarantees. Service providers using white-label softphone platforms can compete with OTT apps while maintaining telco-grade reliability.