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ONE World Favoriten
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ONE World Gasometer
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ONE World Landstrasse
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ONE World Lugner-City
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ONE World Mariahilf
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ONE World Meidling
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ONE World Stephansplatz
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Operator Telekommunikation GmbH
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Opoku KEG
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ORF Online und Teletext GmbH
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PanTel Telecommunications and Communication Services GmbH
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PANTELIC KEG
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PBC Telecommunications Services GmbH
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Personic communication technology GmbH
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Priority Telecom GmbH
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Procard Phone Service GmbH
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PSINet Austria GmbH
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PTI Telecom GmbH
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R-DATA EDV u ISDN-Technik
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Radianz GmbH