ETSI ETS 300 356-19
- Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 19: Three-Party (3PTY) supplementary service [ITU-T Recommendation Q.734, clause 2 (1993), modified]
- standard by European Telecommunications Standards Institute, 02/01/1995
- Publisher: ETSI
$7.00$14.00
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