Acronyms von A bis Z
Q.939
Empfehlung der "CCITT"/"ITU" von 1993: Digital Subscriber Signalling System No. 1 (DSS 1) - Typical DSS 1 service indicator codings for ISDN telecommunications services
Empfehlung der "CCITT"/"ITU" von 1993: Digital Subscriber Signalling System No. 1 (DSS 1) - Typical DSS 1 service indicator codings for ISDN telecommunications services