No title
CCITT
BLUE BOOK,VOLUME VI,FASCICLE VI.3: SPECIFICATIONS OF SIGNALLING SYSTEM NO 6,RECOMMENDATIONS Q.251 - Q - GENEVA ITU 1989 - 152
SC-021
ERNET
335
BLUE BOOK,VOLUME VI,FASCICLE VI.3: SPECIFICATIONS OF SIGNALLING SYSTEM NO 6,RECOMMENDATIONS Q.251 - Q - GENEVA ITU 1989 - 152
SC-021
ERNET
335