Hello,
The problem is that ISDN is a synchronous connection and that cable modems are asynchronous. It is technically not possible to call an ISDN line from a cable modem directly, due to this difference.
Currently you can only make ISDN to ISDN calls and IP to IP calls. IP to ISDN (or the other way around) is not possible.
Maybe if someone sets up a kind of bridging service it would be possible but until then you will need ISDN if you want to make a call to an audio codec that is on ISDN only.
Best regards,
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