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ETS 300 745 - Message Waiting Indication (MWI)
* ETS 300 259 - Path Replacement Additional Network Feature (ANF-PR)
* ETS 301 258 - Recall Supplementary Service (SS-RE)
* ETS 301 919 - Single Step Call Transfer Supplementary Service (SS-SSCT)Source : (ETSI)

* CCITT G.703 - Describes the physical/electrical characteristics of hierarchical digital interfaces. Source : (ITU)

See also

*H.450
*DPNSS

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