Turning an Unrooted Android Phone into a Cellular SIP Gateway for Asterisk with Shizuku
I have previously built cellular gateways for Asterisk out of EC20 and EG25 modules (Using EC20 Module, Asterisk, and FreePBX for SMS Forwarding and VoIP, Connecting a DJI/Baiwang Enhanced Transmission Module to Asterisk and Telegram SMS Bots), and used Flexisip to fix SIP clients missing calls in the background (Adding SIP Push to Asterisk/FreePBX with Flexisip and a Custom Linphone Build). One piece was still missing: some SIM cards simply do not work well in a module, and the easiest fix would be to let an ordinary Android phone act as the gateway itself. ...