Chapter 4:  Using the Commands
 April 15, 2008 G24-L AT Commands Reference Manual 4-17
Conference Call
atd051632601;  //Dialing the first member of the conference
OK
OK
AT+CHLD=2    //Call hold, switch command
OK              //Active call switched to hold
atd035659260;  //Calling the second member of the conference
OK
OK 
(Dual call state: one call on hold; 2nd is active.)
AT+CHLD=3   //Call link command
OK           //Held call is linked to active call
(Active conference of two calls)
AT+CLCC  //Verifying call state through CLCC
//(Verifying call state is optional.)
+CLCC: 1,0,0,0,1,"051632601",129,""
+CLCC: 2,0,0,0,1,"035659260",129,""
ath //Hang up the conference call
NO CARRIER  //First member dropped
NO CARRIER  //Second member dropped
OK