[Hilo] Could you give an example for multi call?

Answer: Yes please find the following example:
AT+CCWA=1,1,1 ==>To enable voice call waiting
OK
ATD1391234xxxx; ==>A call B
OK
+CCWA: “1391234xxxx”,161,1,0 ==>C is coming
AT+CHLD=2 ==>Hold AB, accept C, Then AC is active.
OK
AT+CLCC
+CLCC: 1,0,1,0,0==> call 1(AB) is Hold.
+CLCC: 2,1,0,0,0,“1391234xxx”,161 ==> call 2(AC) is active.
OK
AT+CHLD=21 ==> Place ONLY call 1(AB) active.
OK
AT+CLCC
+CLCC: 1,0,0,0,0 ==> call 1(AB) is active.
+CLCC: 2,1,1,0,0,“1391234xxxx”,161 ====> call 2(AC) is hold.
OK
AT+CHLD=22 ==> Place ONLY call 2(AC) active
OK
AT+CLCC
+CLCC: 1,0,1,0,0 ==> call 1(AB) is Hold.
+CLCC: 2,1,0,0,0,“1351066xxxx”,129 ==> call 2(AC) is active.
OK