"Over The Wire’s 'ISDN Shutdown Survival Guide' is a great summary of the options communication users have to navigate Australia's ISDN shutdown. More modern and flexible Communication technologies are now available which can be taken as a Service (CaaS). I recommend reading the advantages of this approach in OTW’s Guide"
MANAGING DIRECTOR, PETRICHOR COMMUNICATIONS
This year Telstra will begin to shut down the Integrated Services Digital Network (ISDN). If your business is still using traditional phone lines, you must prepare for a change or risk having your calls cut off.