>ETSI ETR 256 Integrated Services Digital Network (ISDN); Signalling System No.7; Telephone User Part Plus (TUP+) [CEPT Recommendation T/S 43-02 E (1988)]
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in stockReleased: 1996-03-15
ETSI ETR 256
Integrated Services Digital Network (ISDN); Signalling System No.7; Telephone User Part Plus (TUP+) [CEPT Recommendation T/S 43-02 E (1988)]