Motorola g20 - Table 21. +CHLD Parameters; Table 22. +CHLD Actions According to Call State and Operation

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AT Commands Reference
Test Command
The Test command returns <n> values supported by the g20 to the terminal.
The following table shows the +CHLD parameters.
The following table shows the +CHLD actions according to state and operation:
Command Response/Action
+CHLD=? +CHLD: (0,1,1x,2,2x,3)
OK
Table 21. +CHLD Parameters
<Parameter> Description
<n> Call hold operation:
0 Releases all held calls
OR
Sets User Determined User Busy for a waiting call
1 Releases all active calls and accepts the held or waiting call
1x Release specific call x, where x is the serial number of a call
participating in an active MTPY call.
2 Places all active calls on hold and accepts the held or waiting call
2x In the case of an active MTPY call, places all active calls on hold,
except for call x. Call x remains active.
3 Adds a held call to the conversation - MTPY
Note: "Held calls" or "active calls" means a held or active single or
MTPY call. There cannot be two or more different held/active
single/MTPY calls.
Table 22. +CHLD Actions According to Call State and Operation
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
IDLE Error 3
Single
Active Call
Error 3. Releases
active call.
If x=1,
releases
active call,
otherwise
error 22.
Puts active
call on hold.
Error 3. Error 3.