DIN EN 301810:2004-12
Действует
Private Integrated Services Network (PISN) - Inter-exchange signalling protocol - Private User Mobility (PUM) - Call handling Additional Network Feature (ANF) (ISO/IEC 17878 (2003), modified) (Endorsement of the English version EN 301810 V1.2.1 (2004-01) as German standard)
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