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I can confirm this. My bro using TPG cannot call my home fixed line.
Understand from TPG customer service that if the fixed line is ported over (eg my fixed line is from old Singtel to M1 broadband fixed line) it will not work.
yeah, because most of these Ported Fixed Line are switched to digital signals. Last time, Singtel is using Analog, even if blackout, still able to call as it uses a different electrical source. Digital lines, once ONT is down, cannot call out.


