Siemens TC35i User Manual page 231

TC35i AT Command Set
9.8 AT+CHLD
1X
2
2X
3
Notes
• The command offers a broad range of options according to the GSM specifications. However, if you
AT+CHLD
attempt to invoke an option which is not provisioned by the network, or not subscribed to, invocation of this
option will fail. The responses in these cases may vary with the network (for example "Operation not allowed",
"Operation not supported" etc.).
• This Supplementary Service is only applicable to Teleservice 11 (Speech telephony), that is, voice calls can
be put on hold, while data or fax calls cannot. For example, with
voice call on hold and accept another waiting voice call. But it is possible to place a voice call on hold in order
to accept a waiting data of fax call, and afterwards recover the voice call. In this case, the only difference over
speech telephony is that the data or fax call needs to be manually accepted via
• In conflict situations, e.g. when a waiting call comes while there are already held calls, the above procedures
apply to the waiting call only. For example,
• See also the
AT+CCWA
Example
^SYSSTART
at+cpin="9999"
OK
+CREG: 2
+CREG: 1,"0145","0016"
at+ccwa=1,1,1
OK
atd"1234567";
OK
+CCWA: "+491791292364",145,32,,0
at+chld=2
RING
TC35i_ATC_V02.07
Confidential / Released
Terminate a specific call X (X= 1-7). The call may be active, held or waiting.
The remote party of the terminated call will receive a "NO CARRIER" indica-
tion. Parameter X is the call number
rent calls available with AT command
Place all active calls on hold (if any) and accept "the other call" as the active
call:
• If a call is waiting, the waiting call will be accepted.
• Otherwise, if a held call is present, the held call becomes active.
Place all active calls except call X (X= 1-7) on hold. Parameter X is the call
number of the targeted call in the list of current calls available with AT
<idx>
command
AT+CLCC
Add a held call to the active calls in order to set up a conference (multiparty)
call.
=0 rejects the waiting call, but does not affect the held calls.
<n>
command for details on how to display waiting calls.
Page 231 of 439
of the targeted call in the list of cur-
<idx>
AT+CLCC
.
=2 you can simultaneously place a
AT+CHLD
The mobile is now registered.
You activate the indication of waiting calls during
voice calls.
You make a voice call.
You receive a URC indicating a waiting data call.
You put the voice call on hold.
You now receive the RING of the data call.
s
m
obile
.
(see example below).
ATA
1/30/04