This European Telecommunication Standard (ETS) specifies procedures to support supplementary services for Broadband Integrated Services Digital Network (B-ISDN) Capability Set 1 (CS1) applications defined for the pan-European B-ISDN as provided by the European public telecommunications operators by means of the Signalling System No.7 protocol for the B-ISDN User Part (B-ISUP).
IN_DEVELOPMENT
prSSH ETS 300 657:1997 ed.1
40.20
DIS ballot initiated: 12 weeks
Feb 9, 2026
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