PIONEERPOS G24-LC manual At+Chld=?, AT+CHLD=3, AT+CHLD=22

Call Control

Table 3-11: +CHLD Actions According to Call State and Operation (Cont.)

			CHLD <operation>
Call State	0 -Release	1 - Release	1x - Release	2 - Switch	2x - Active	3 - Add Held
		Active Call,	Active/Held	Between	MTPY Call to
						Call to
	Held Call	Accept Held	Call x from	Held and	Hold, Except
						Active Call
		Call	MTPY Call	Active Call	for Call x
Held (Single	Releases	Accepts	Error 3.	Accepts	Error 3.	Error 3.
or MTPY)	waiting call.	waiting call.		waiting call.
Call and
Waiting Call
Single (or	Releases	Releases	Releases	Error 3 (too	Error 3.	Makes a
MTPY)	waiting call.	active call,	specific	many calls on		conference
Active Call		and accepts	active call x.	hold.		call. Waiting
and Single (or		waiting call.	If x does not			call is not
MTPY) Held			exist, then			touched.
and Waiting			error 22.
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	//Release the active call
NO CARRIER
OK
atd9311234567;	//Originate a voice call
OK

3-26 G24-L AT Commands Reference Manual April 15, 2008