- Dial-up Internet service providers, using client-supplied telecommunications connections
- Earth stations (except satellite telecommunication carriers)
- Internet service providers, using client-supplied telecommunications (e.g., dial-up ISPs)
- On-line access service providers, using client-supplied telecommunications (e.g., dial-up ISPs)
- Radar station operations
- Satellite telemetry operations on a contract or fee basis
- Satellite tracking stations
- Telemetry and tracking system operations on a contract or fee basis
- VoIP service providers, using client-supplied telecommunications connections
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