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| secondary PABX (centrale d'abonné); satellite PABX (centrale d'abonné); satellite exchange (centrale d'abonné); sub-exchange (subscriber exchange, centrale d'abonné); subcenter (centrale d'abonné); sub-office (côté PTT) | |||
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| slave control unit | |||
| sous-central: 12 phrases in 6 subjects |
| Economy | 1 |
| Finances | 3 |
| General | 5 |
| Information technology | 1 |
| Name of organization | 1 |
| United Nations | 1 |