中華人民共和國國家標準
NATIONAL
STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB/T 17789-1999
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 在PSTN或二線點對點租用電話型電路上同時傳送數據和數字化編碼語音信号的規程
Issued Date:1999-07-13
Implemented Date:2000-01-01
Issued by:
The Standardization Administration of the People's Republic of China