No title
CCITT
BLUE BOOK,VOLUME II,FASCICLE II.1: GENERAL TARIFF PRINCIPLES CHARGING AND ACCOUNTING IN INTERNATIONAL - GENEVA ITU 1989 - 368
SC-021
ERNET
335
BLUE BOOK,VOLUME II,FASCICLE II.1: GENERAL TARIFF PRINCIPLES CHARGING AND ACCOUNTING IN INTERNATIONAL - GENEVA ITU 1989 - 368
SC-021
ERNET
335