DIN ETS 300346:1998-07 Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Message Transfer Part (MTP) protocol Tester (MT); English version ETS 300346:1997
1998DIN ETS 300346:1998-07 Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Message Transfer Part (MTP) protocol Tester (MT); English version ETS 300346:1997
1998DIN ETS 300346:1998 Integrated Services Digital Network (ISDN) - Signalling System No. 7 - Message Transfer Part (MTP) protocol Tester (MT); English version ETS 300346:1997