ETSI EN 300 356-12
- Integrated Services Digital Network (ISDN); Signalling System No.7 (SS7); ISDN User Part (ISUP) version 4 for the international interface; Part 12: Conference call, add-on (CONF) supplementary service [ITU-T Recommendation Q.734, clause 1 (1993) and imple
- standard by European Telecommunications Standards Institute, 07/01/2001
- Publisher: ETSI
$7.00$14.00
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