AT Commands Reference Manual - wireless netcontrol GmbH

Call Control
NO CARRIER
// BUSY appears on other device
OK
RING
// MT voice call
AT+CHLD=1
OK
// accept the MT call
AT+CHLD=1
//Release the active call
NO CARRIER
OK
RING
// MT voice call
AT+CHLD=11
+CME ERROR: operation not allowed
RING
AT+CHLD=2
OK
// accept the MT call
AT+CHLD=1
//Release the active call
NO CARRIER
OK
RING
// MT voice call
AT+CHLD=21
OK
// accept the MT call
ATH
//Release the active call
NO CARRIER
OK
RING
AT+CHLD =22
+CME ERROR: operation not allowed
RING
AT+CHLD =3
+CME ERROR: operation not allowed
RING
AT+CHLD=1
// accept the MT call
OK
ATH
//Release the active call
NO CARRIER
OK
atd9311234567;
//Originate a voice call
OK
OK
(...conversation...)
+CCWA: "+358317654321",145,1,"Bob" //Awaiting call alerts
AT+CHLD=2
//Put first call on hold and answer the second call
OK
(...conversation...)
AT+CHLD=3
//Add the held call to the conversation
OK
(...MTPY conversation...)
AT+CHLD=22
//Split: Place the MO active call on hold, MT call remains active
OK
AT+CHLD=0
//Release the held call
OK
NO CARRIER
3-28 H24 - AT Commands Reference Manual April 15, 2010