I have a router with OpenWrt installed (orange pi zero with expansion card). I put an external USB modem with a phone SIM card and i configure it to provide an internet connection to the router (it's for a rural localization).
Would it be possible to connect some kind of external phone to make phone calls through OpenWrt?
But i want to do the call using the phone SIM card installed on the router, with any software/package on openwrt that do that operation.
i have for calls and data on that sim, and i want to use it with an external phone connected to the router.