Recommendation I.251.1 (11/1988): Number identification supplementary services: Direct-Dialling-In (DDI) (Q26985369)
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superseded recommendation/international standard from the International Telecommunication Union
- ITU-T I.251.1
| Language | Label | Description | Also known as |
|---|---|---|---|
| English | Recommendation I.251.1 (11/1988): Number identification supplementary services: Direct-Dialling-In (DDI) |
superseded recommendation/international standard from the International Telecommunication Union |
|
Statements
Number identification supplementary services: Direct-Dialling-In (DDI) (English)
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11/1988
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25 November 1988
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8
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Identifiers
I.251.1 (11/1988)
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