Extracting MBNs from Xiaomi Firmware to Add VoLTE Carrier Profiles to Quectel EC20/EG25 Modules
In an earlier post, I wrote about using an EC20 module with Asterisk and FreePBX for SMS forwarding and VoIP. Although the EC20 can switch carrier profiles with AT+QMBNCFG, the selection built into the module is quite limited. My EC20 R06, for example, came with only four profiles: ROW, China Unicom, China Telecom, and China Mobile. Another EG25-like module had twenty profiles, but still lacked VoLTE profiles for some Hong Kong carriers. ...