AT Commands Reference Manual - wireless netcontrol GmbH

Call Control
Call Control
The following figure is a detailed view of the states the H24 goes through for outgoing voice call.
Note that between the first "OK" is received to the second "OK" the actual connection occurs
(call state is alert).
Idle
Dial
Released
Alert
Connected
Hold
Figure 4-8: Call States
Dialing Using ATD
atd+44 34 56 78; // VOICE call; number includes international access code
OK
OK
atd17085763400; //Second VOICE call
OK
OK
//Call to 44345678 is being put on hold
ath
//Hang up active call
NO CARRIER
OK
AT+CHLD=0
//Hang up held call
NO CARRIER
OK
atd+44 34 56 78
//DATA call
...
CONNECT
//Move to online Data state
+++ //ESC sequence back to the Command state. +++ is sent from the
terminal (+++ is not displayed)
ath
//Hang up data call
NO CARRIER
OK
//Data call terminated
AT+FCLASS=1 //change outgoing call type to fax
OK
AT+CBST=7,1,0
// set bearer service setting to fax
OK
AT+COPS=,,,0
// change to GSM
OK
4-12 H24 - AT Commands Reference Manual April 15, 2010