What is DTLS

Datagram Transport Layer Security (DTLS) is a protocol used to secure data sent over UDP. It builds on TLS, which is used to protect web traffic, but works better for real-time communication such as VoIP and video calls.

TLS runs over TCP. This creates a connection before any data moves, which adds delay. In contrast, DTLS uses UDP to send data without setup time. That makes it a better choice for voice and video, where low latency matters.

DTLS protects against eavesdropping, spoofing, and tampering. It encrypts each message, checks its integrity, and confirms the sender.

While DTLS isn’t limited to VoIP, its main role in 3CX is to protect WebRTC browser calls. It also secures online games, VPN tools, and messaging platforms that rely on UDP. These services all require fast, encrypted delivery.

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