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Zeichengabesystem Nr.7
el.
common channel signaling 7
;
common channel signalling 7
Zeichengabesystem Nr. 7
commun.
Signalling System No 7
Zeichengabesystem-Nr.7
commun.
signalling system No.7
(ITU-T (CCITT) Rec. Q.701-764, FTZ RL 1R7)
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