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Signalling System No 7

commun. Zeichengabesystem Nr. 7
signalling system No.7
commun. Zeichengabesystem-Nr.7 n (ITU-T (CCITT) Rec. Q.701-764, FTZ RL 1R7); ZGS7 m (ISDN); ZGS-Nr.7 m (Zeichengabesystem n Nr.7, ISDN)
signalling system no.7
gen. Zeichengabeverfahren Nr.7

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