| Segment specification | CTA |
| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| To identify a person or a department to whom communication should be directed. |
| —————————————————————————————————————————————— |
| 010 |
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3139 | Contact function code | C | 1 | an..3 | |||||||||
| 020 |
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C056 | Contact details | C | 1 | |||||||||
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C | 1 | an..17 | |||||||||
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C | 1 | an..256 |
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