Siemens MC55 사용자 설명서

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MC55_ATC_V01.05

Page 231 of 469

2/10/04

Confidential / Released

1X

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 

 of the targeted call in the list of cur-

rent calls available with AT command 

. 

2

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. 

2X

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

command 

. 

3

Add a held call to the active calls in order to set up a conference (multiparty)
call. 

• The 

 command offers a broad range of options according to the GSM specifications. However, if you

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 

=2 you can simultaneously place a

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 

 (see example below). 

• 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, 

=0 rejects the waiting call, but does not affect the held calls.

• See also the 

 command for details on how to display waiting calls.

^SYSSTART

at+cpin="9999"

OK

+CREG: 2

+CREG: 1,"0145","0016"

The mobile is now registered.

at+ccwa=1,1,1

You activate the indication of waiting calls during
voice calls.

OK

atd"1234567";

You make a voice call.

OK

+CCWA: "+491791292364",145,32,,0

You receive a URC indicating a waiting data call.

at+chld=2

You put the voice call on hold.

RING

You now receive the RING of the data call.