CEPT - T/SF 31-07 E
Operational Requirements of ISDN Supplementary Services
active, Most Current
| Organization: | CEPT |
| Publication Date: | 1 January 1987 |
| Status: | active |
| Page Count: | 89 |
Document History
T/SF 31-07 E
January 1, 1987
Operational Requirements of ISDN Supplementary Services
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