AT Commands Reference Manual - wireless netcontrol GmbH

Chapter 3: AT Commands Reference
A NO CARRIER message is returned to the terminal before the regular OK approval.
Note: To terminate (hang-up) a MO data/fax call while call is placed: Any character sent from
the terminal to the H24 causes the Data/Fax call termination, and NO CARRIER is sent
from the H24 to the terminal.
To terminate a held Voice call or to terminate a call out of a MTPY call, refer to “+CHLD,
Call Related Supplementary Services Command” on page 3-24.
The following table shows the call states of the ATH command.
Call State
Response/Action
IDLE
Single Active
MTPY Active
Incoming call (RING)
Single Active and Waiting Call
MTPY Active and Waiting Call
Single Held or MTPY Held
Single (or MTPY) Active and Single (or
MTPY) Held
Held (Single or MTPY) and Waiting Call
Single (or MTPY) Active and Single (or
MTPY) Held & Waiting call
CME ERROR: operation not allowed
Call released
All calls released
Call released
Single Active released (waiting not affected)
MTPY Active released (waiting not affected)
CME ERROR: operation not allowed
Single (or MTPY) Active released
Waiting call released
Single (or MTPY) Active released
Example
RING
//Incoming call
RING
//Incoming call
ath
//Hang-up incoming call
NO CARRIER
OK
//Incoming call has been terminated - user determined user busy
RING
ata
OK
//Voice call connected
ath
//Hang-up connected call
NO CARRIER
OK
//Active call has been hung-up - terminated
(... Active multi party call, with 3 numbers …)
ath
NO CARRIER
NO CARRIER
NO CARRIER
OK
atd035659260;
OK
ath
//Terminate MO voice call while placed
April 15, 2010 H24 - AT Commands Reference Manual 3-17