| Directory | Messages | Segments | Composites | Data elements | Codes | Meaning of the change indicators |
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| Communication number of a department or employee in a specified channel. |
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| 010 | 3148 | Communication address identifier | M | 1 | an..512 | ||
| 020 | 3155 | Communication means type code | M | 1 | an..3 | ||
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