ITU-T-Q.411 › Line Signalling Code
ITU-T-Q.411
-
1988 EDITION
-
CURRENT
Line Signalling Code
Document Number
ITU-T-Q.411
Revision Level
1988 EDITION
Status
Current
Publication Date
Nov. 1, 1988
ITU-T-Q.411
1988 EDITION
Current
Nov. 1, 1988