ETSI EN 300 485
ETSI EN 300 485
Integrated Services Digital Network (ISDN); Definition and usage of cause and location in Digital Subscriber Signalling System No. one (DSS1) and Signalling System No.7 ISDN User Part (ISUP) [ITU-T Recommendation Q.850 (1998), modified]
standard published 10/01/1999 by European Telecommunications Standards Institute
