ITU-T I.253.1
Call Waiting (CW) Supplementary Service (Study Group I) 15 pp
active, Most Current
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| Organization: | ITU-T |
| Publication Date: | 1 July 1990 |
| Status: | active |
| Page Count: | 15 |
Document History
ITU-T I.253.1
July 1, 1990
Call Waiting (CW) Supplementary Service (Study Group I) 15 pp
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