https://www.youtube.com/watch?v=n_txukfW3uE
How to turn Raspberry Pi into FreePBX-based GSM gateway
(needs 3g modem)
Or, if willing to pay for the SIP trunk termination instead of buying a 3g modem, AWS based method -
https://www.youtube.com/watch?v=n_1wX7kKx7k
Quite interesting.
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