How to start +EcallInit

I tried to excute commnad: AT+ECALLINIT but it returned ERROR.
My system:
R7.54.15.A1.201708030847.SL8082BTAR
+WOPEN: 2,“AT v06.54A1”
Please help me. Thanks.

Hi,
You can use AT+ECALLINIT command after running “UnEcall_AT_Cmd Sample” OAT application. This command requires certain ecall libraries to run , which is available in the mentioned application.

Thanks & Regards,
Rex