Cisco Systems' Skinny Client Control Protocol (SCCP) uses Internet TCP port 2000. This protocol is used for communication between Cisco Unified Communications Manager and Cisco VoIP phones. Additionally, some older versions of Shoutcast, a proprietary software used for streaming media over the Internet, also use this port. However, it's important to note that port 2000 can be used by any application, and its usage is not strictly defined.
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