ETSI EN 300 359-2
ETSI EN 300 359-2
Integrated Services Digital Network (ISDN); Completion of Calls to Busy Subscriber (CCBS) supplementary service; Digital Subscriber Signalling System No. one (DSS1) protocol; Part 2: Protocol Implementation Conformance Statement (PICS) proforma specification
standard published 06/01/2001 by European Telecommunications Standards Institute
