98-08901C68-O 71
AT Commands Reference
Example
at+chld=?
+CHLD: (0, 1, 1x, 2, 2x, 3)
OK
at+ccwa=1 //Enable call waiting
OK
atd9311234567; //Originate a voice call
OK
CONNECT
(...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 //Release the active call
NO CARRIER
OK
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"
Table 22. +CHLD Actions According to Call State and Operation (Continued)
Call State
CHLD <operation>
0 -Release
Held Call
1 - Release
Active Call,
Accept Held
Call
1x - Release
Active Call x
from MTPY
Call
2 - Switch
Between
Held and
Active Call
2x - Active
MTPY Call
to Hold,
Except for
Call x
3 - Add
Held Call to
Active Call