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Google Talk Voice & Video
Port 19302 is primarily used by Google Talk services for establishing voice and video call connections. It's widely utilized in Google's WebRTC infrastructure, which enables browsers and mobile applications to communicate in real-time using peer-to-peer connections. This port is essential in facilitating media negotiation and relay through Google's STUN servers, helping traverse NATs and firewalls for seamless user experience..
Port 19302 serves as a key component within Google’s WebRTC signaling and media relay framework. It supports the traversal of NAT (Network Address Translation) devices by enabling clients to contact Google-operated STUN (Session Traversal Utilities for NAT) servers. These servers help clients discover their public IP addresses and network conditions, facilitating connection setup for real-time media streams.
When initiating a voice or video call through services such as Google Hangouts, Google Chat, or other applications utilizing Google’s WebRTC backend, client applications use UDP on port 19302 to communicate with these STUN servers. This assists in negotiating ICE (Interactive Connectivity Establishment) candidates that allow a peer-to-peer connection to be established whenever possible, or to fall back to relay servers (TURN) if direct communication is blocked.
Since WebRTC is deeply embedded in many modern communication applications, port 19302 has become a default signaling port for negotiating media paths. It predominately handles ICE negotiation messages and assists media traversal rather than directly carrying media content. This port is unofficial but extensively used across Google’s communication products.