Grandmother of my friend lives in mountains where is no internet but there is GSM cover. My friend lives abroad and GSM calls cost too much. He asks to find some way to make a bridge from internet call to GSM call. Internet call could be what's ever Viber, Telegram, Whatsap, custom SIP.

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    What you want is possible using Asterisk as SIP provider and a GSM phone connected to the PC via Bluetooth. As it is a quite complex topic it requires a bit of work (never did it personally). See e.g. voip-info.org/chanmobile – Robert Jul 2 '20 at 7:19

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