Chapter 3: AT Commands Reference
June 30, 2008 AT Commands Reference Manual 3 -27
The following table shows the +CHLD actions according to state and operation:Tabl e 3- 11: +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/Held
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.
MTPY Active
Call Error 3. Releases
active call. Releases
specific
active call x.
If x does not
exist, then
error 22.
Puts active
call on hold. Split. If call x
does not exist,
then error 22.
Error 3.
Incoming
Call (RING) Error 3.
Single Active
Call and
Waiting Call
Releases
waiting call. Releases
active call,
accepts
waiting call.
Releases
specific
active call x.
If x does not
exist, then
error 22.
Puts active
call on hold,
accepts
waiting call.
Error 3. Error 3.
MTPY Active
Call and
Waiting Call
Releases
waiting call. Releases
active call,
accepts
waiting call.
Releases
specific
active call x.
If x does not
exist, then
error 22.
Puts active
call on hold
and accepts
waiting call.
Split. If x
does not exist,
then error 22.
Error 3.
Single Held
Call Releases held
call. Accepts held
call. Releases held
call. Accepts held
call. Error 3. Error 3.
MTPY Held
Call Releases held
call. Accepts held
call. Releases
specific
call x. If x
does not exist,
then error 22.
Accepts held
call. Error 3. Error 3.
Single (or
MTPY)
Active Call
and Single (or
MTPY) Held
Call
Releases held
call. Releases
active call
and accepts
held call.
Releases
specific
active call x.
If x does not
exist, then
error 22.
Switches. Error 3. Makes a
conference
call.