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Dial out or SMS is not the same that open an audio channel.
This project works on dongles directly opening an audio channel via the modem.
Phones dont allow that in this way, for security reasons.
Can be achieved, for sure, but no with chan dongle.
( some old info at https://www.elastix.org/community/threads/mobile-phone-as-gsm-trunk.37241/ )
In an old time, i use chan_mobile. It works, but bluetooth is not the best link when you have a bunch of phones on it. Even latency was awfull.
Some phones can convert USB port in an audio device (ie https://www.youtube.com/watch?v=PgNl051jm2Y )
But not all. Try it.
If you need more info, ask me in private.