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Windows Live Messenger Voice
Port 6901 was commonly used by Windows Live Messenger for its voice chat functionality, enabling users to engage in real-time audio conversations alongside instant messaging. This port facilitated media streaming required for voice communication, relying on both TCP and UDP protocols for establishing connections and managing data transfer. Although the service is largely obsolete today, the port still highlights legacy voice-over-IP communication support within consumer instant messaging clients..
Port 6901 was historically utilized by Microsoft’s Windows Live Messenger application, specifically for enabling voice chat features. The port allowed peer-to-peer communication streams to be established between Messenger clients, supporting the transmission of audio data necessary for VoIP calls. It operated over both TCP and UDP protocols to manage connection establishment, session maintenance, and data flow depending upon network conditions.
The TCP protocol on port 6901 was generally used to manage signaling and session control messages needed to initiate and terminate voice calls. Meanwhile, the UDP protocol facilitated the actual streaming of real-time audio data, benefiting from lower latency and tolerating occasional data loss inherent in live communication tasks.
With the discontinuation of Windows Live Messenger, port 6901’s specific usage waned. However, understanding its technical role provides insight into early voice chat implementations in IM clients, employing a combination of transport protocols to balance reliability and performance in real-time communications scenarios.