Standards
[CURRENT]
NF Z82-263
; NF ETS 300263:1995-11-01
NF Z82-263
; NF ETS 300263:1995-11-01
Integrated Services Digital Network (ISDN). Telephony 7 kHz teleservice. Service description
Title (German)
ISDN. TELEDIENST "7-KHZ TELEFONDIENST". DIENSTBESCHREIBUNG