AT Commands Reference Manual - wireless netcontrol GmbH

Call Control
NO CARRIER
OK
Example - Hanging up a data call:
atd035659260
CONNECT
//Data call connected - Online Data mode
…
+++ //ESC Sequence is sent from the terminal to the device
OK
//The device is in Command mode
ath
//Terminate Data call
NO CARRIER
OK
A, Answer Incoming Call
This command answers an incoming VOICE/DATA/FAX call after a RING/+CRING indication
is sent to the terminal.
If the incoming call is answered (connected), the H24 sends a OK/CONNECT notification to the
terminal.
If the MT call fails, the possible notifications are:
• NO CARRIER - Connection Failure
• ERROR - General Failure
Note: A waiting call (an incoming call while a call is in progress) is announced by +CCWA
rather than RING. A waiting call can be answered only if it is a voice call. The waiting
voice call should be answered using the ATA command, which will put the active call on
hold and will connect the waiting call, making it the active call. This ATA action is the
same action as AT+CHLD=2.
Example
Example - Answering a voice call:
AT+CRC=1
+CRING: VOICE
+CRING: VOICE
ata
OK
ath
NO CARRIER
OK
//VOICE call connected - device is in Command mode
Example - Answering a data call:
+CRING: REL ASYNC
+CRING: REL ASYNC
ata
... //Connecting (dots are not displayed)
OK
//DATA call connected - device is in Online Data mode
Note: In a CSD call, call release is not valid during the phase of call negotiation (from OK until
connect call).
3-18 H24 - AT Commands Reference Manual April 15, 2010