ISDN30 Beginners Guide
[ad_1] ISDN 30 is a primary rate service. It is available in DASS, I.421 and ISDN30e versions. ISDN30 DASS. ISDN 30 (DASS 2) conforms to BT's own standard (see I.421 for Euro version). ISDN 30 is...
[ad_1] ISDN 30 is a primary rate service. It is available in DASS, I.421 and ISDN30e versions. ISDN30 DASS. ISDN 30 (DASS 2) conforms to BT's own standard (see I.421 for Euro version). ISDN 30 is...