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DIN ETS 300240
Private Telecommunication Network (PTN); signalling at the S-reference point; generic feature key management protocol for the control of supplementary services; English version ETS 300240:1993
Edition
1993-12
DIN ETS 300102-1
Integrated Services Digital Network (ISDN); user-network interface layer 3; specification for basic call control; english version ETS 300102-1:1990
Edition
1992-02
