Data Sheet

Smart Machine Smart Decision
Call dropped
Make a voice call using the last number ATD6241xxxx; OK
facility. The initial call is established and ATH OK
then cancelled. The second call is made ATDL OK
using the previous dial string.
Example of a MT voice call ATA RING
Make MT voice call to MS. ATH RING
OK[accept call]
OK[hang up call]
Call related to supplementary service:
AT+CHLD. This Command provides
AT+CHLD=<N> Return
value:(0,1,1x,2,2x,3,4)
support for call waiting functionality.
Terminate current call and accept waiting
call.
Establish a voice call from EVB, receive
an incoming call (incoming call accepts
waiting status), terminate active call and
accept incoming call. Note call waiting
must be active for this option – use
"AT+CCWA=1,1” before running this
AT+CCWA=1,1 OK
ATD6241xxxx; OK
<RX incoming call> RING
+CCWA: "62418148 ",
AT+CHLD=1 129,1,""
OK
<waiting call active>
demonstration.
Set current call to busy state and accept
waiting call.
Establish a voice call from EVB, receive
an incoming call (incoming call accepts
waiting status), place active call on hold
and switch to incoming call. Terminate
active call and switch back to original
call. Note call waiting must have been
previously enabled for this
ATD6241xxxx; RING
<RX incoming call> +CCWA: "1391818
6089",129,1,""
AT+CHLD=2 OK
<waiting call active other
AT+CHLD=1 call on hold>
OK
<incoming call terminated,
dialed number now active>
demonstration to work.
Switch between active and held calls.
Establish a voice call from EVB, receive
an incoming call (incoming call accepts
waiting status), place active call on hold
and switch to incoming call. Switch
between both calls, placing each in the
hold state whilst the other is active
before terminating each one. This feature
relies on knowing each call’s ID. This is
done using the List Current Calls
(AT+CLCC) Command. A call’s ID is
required to switch between held and
ATD6241xxxx; OK
RING
<RX incoming call> +CCWA: "1391818
6089",129,1,""
AT+CHLD=2 OK
<incoming call activated,
original on hold>
OK
AT+CHLD=21 <original call activated,
incoming call held>
AT+CLCC +CLCC:1,0,0,0,0,"62
SIM800 Series_AT Command Manual_V1.05 348 2014-07-31