Port 23399
Skype Protocol
Skype primarily uses port 23399 for its peer-to-peer communications, enabling voice, video, and instant messaging. This port facilitates the connection through Skype's custom protocol, allowing users worldwide to communicate seamlessly across various network configurations..
Technical Details
Skype utilizes proprietary protocols to establish direct or relay communications between clients. Port 23399 is commonly associated with Skype’s Default Protocol, which aids in peer discovery and connection establishment when other preferred ports are unavailable. It assists Skype in negotiating NAT traversal and firewall bypassing mechanisms.
Skype’s protocol adapts dynamically depending on the network environment, choosing between UDP and TCP variants or custom implementations. It uses port 23399 primarily as a fallback, helping maintain service connectivity and reliability across restrictive or variable network conditions.
Moreover, this port manages signalling, call setup, and media relay aspects essential to the Skype architecture. Since the protocol is proprietary, specific details on message formatting and encryption remain undisclosed, though it heavily relies on Microsoft’s cloud infrastructure for control and authentication services.