No title
CCITT
BLUE BOOK,VOLUME VI,FASCICLE VI.2: SPECIFICATIONS OF SIGNALLING SYSTEMS NOS 4 AND 5,RECOMMENDATIONS Q - GENEVA ITU 1989 - 112
SC-021
ERNET
335
BLUE BOOK,VOLUME VI,FASCICLE VI.2: SPECIFICATIONS OF SIGNALLING SYSTEMS NOS 4 AND 5,RECOMMENDATIONS Q - GENEVA ITU 1989 - 112
SC-021
ERNET
335