Motorola AT Commands G24-L Developer's Manual page 90

Call Control
Table 3-11: +CHLD Actions According to Call State and Operation (Cont.)
Call State
0 -Release
Held Call
Held (Single Releases
or MTPY) waiting call.
Call and
Waiting Call
Single (or Releases
MTPY) waiting call.
Active Call
and Single (or
MTPY) Held
and Waiting
Call
Split: Places the active MTPY call on hold, except for a specific call x.
Switch: Places the active call on hold and accepts the Held call
Error 3: "Operation not allowed"
Error 22: "Not found"
Example
AT+CHLD=?
+CHLD: (0,1,1x,2,2x,3)
OK
AT+CCWA=1
OK
atd9311234567;
OK
OK
(...conversation...)
+CCWA: "+358317654321",145,1,"Bob" //Awaiting call alerts
AT+CHLD=2
OK
(...conversation...)
AT+CHLD=3
OK
(...MTPY conversation...)
AT+CHLD=22
OK
AT+CHLD=0
OK
NO CARRIER
ath
NO CARRIER
OK
atd9311234567;
OK
3-26
CHLD <operation>
1 - Release 1x - Release
Active Call, Active/Held
Accept Held Call x from
Call MTPY Call
Accepts Error 3.
waiting call.
Releases Releases
active call, specific
and accepts active call x.
waiting call. If x does not
exist, then
error 22.
//Enable call waiting
//Originate a voice call
//Put first call on hold and answer the second call
//Add the held call to the conversation
//Split: Place the MO active call on hold, MT call remains active
//Release the held call
//Release the active call
//Originate a voice call
G24-L AT Commands Reference Manual
2 - Switch 2x - Active
Between MTPY Call to
Held and Hold, Except
Active Call for Call x
Accepts Error 3.
waiting call.
Error 3 (too Error 3.
many calls on
hold.
3 - Add Held
Call to
Active Call
Error 3.
Makes a
conference
call. Waiting
call is not
touched.
April 15, 2008