Motorola G24 Guide Developer's Manual page 112

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//Enable call waiting
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
ath
NO CARRIER
OK
atd9311234567; //Originate a voice call
OK
3-28
1 - Release 1x - Release
Active Call, Active/Held
Accept Held
Call
Accepts
waiting call.
Releases
active call,
and accepts
waiting call.
//Release the active call
AT Commands Reference Manual
CHLD <operation>
2 - Switch
Between
Call x from Held and
MTPY Call Active Call
Error 3. Accepts
waiting call.
Releases Error 3 (too
specific many calls on
active call x. hold.
If x does not
exist, then
error 22.
2x - Active
3 - Add Held
MTPY Call to
Call to
Hold, Except
Active Call
for Call x
Error 3. Error 3.
Error 3. Makes a
conference
call. Waiting
call is not
touched.
December 31, 2007