Internet TCP port 647 is commonly used by the Mumble application, an open-source voice over IP (VoIP) service primarily used by gamers. Mumble uses this port for its server connections, allowing users to communicate with each other during online gaming sessions. The software provides low-latency audio transmission, which is crucial for real-time gaming. Therefore, if port 647 is blocked, users may experience issues with their Mumble application.
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