On Thu 25 Jul at 19:45 John Clarke (3:713/730{at}fidonet) wrote to Arthur Marsh:

 AM> Yes, until the ETSI/OnRamp ISDN becomes widely 
 AM> available, we're stuck with the Australian-specific 
 AM> implementation. I have been in touch with USR about the 
 AM> I-modem but the person I emailed said that an 
 AM> Australian version would be a while yet.

 JC> What is different?  I would have expected that the exchanges 
 JC> in operation here would have been built to International 
 JC> standards (ITU-T?) which *should* make them compatible with 
 JC> overseas ISDN TAs.

The gear manufactured in the late 1980s all had stuff that wasn't (yet)
properly defined in CCITT/ITU-T Recommendations.

Euro-ISDN and National ISDN 1/2/3 in USA/Canada will reduced the number of
varieties of ISDN that equipment would need to support for universal
operation.

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