| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | See Detail | Status | Related Standard |
| GB/T 17789-1999 | English | 629 |
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Procedures for simultaneous transmission of data and digitally encoded voice signals over the PSTN or over 2-wire leased point-to-point telephone type circuits
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GB/T 17789-1999
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GB/T 17789-1999
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