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Try the below script in the AT Command Tester tool
//Script: at_chld.at //Use this script to AT+CHLD AT command //Terminate all held calls AT+CHLD=0 WAIT=2 //Terminate all active calls and accept the other call AT+CHLD=1 WAIT=1 //Terminate a specific call AT+CHLD=11 WAIT=1 //Place all active calls on hold and accept the other call AT+CHLD=2 WAIT=1 //Place all active calls except call X on hold AT+CHLD=22 WAIT=1 //Add the held call to the active calls AT+CHLD=3 WAIT=1 //Connect two calls and cut off the connection between users AT+CHLD=4
Output of the above script in the AT Command Tester tool tool.
AT+CHLD=0 ERROR AT+CHLD=1 ERROR AT+CHLD=11 +CME ERROR: operation not allowed AT+CHLD=2 ERROR AT+CHLD=22 ERROR AT+CHLD=3 ERROR AT+CHLD=4 ERROR