MC55 AT Command Set

9.7 AT+CCWA

s

mobile

check the current call waiting settings with <mode>=2.

The AT+CCWA command has been implemented with the full set of <class> parameters according to GSM 07.07. For actual applicability of SS call waiting to a specific service or service group (a specific <class> value) please consult table A.1 of GSM 02.04

Despite the specifications stated in GSM 02.04 call waiting is not handled uniformly among all networks: GSM 02.04, Annex A, provides the following specification:

"The applicability of call waiting refers to the telecommunication service of the active call and not of the waiting call. The incoming, waiting, call may be of any kind." Nevertheless, networks do differ on the actual imple- mentation of the service. For example, the activation of call waiting for <class> 4, "fax", causes some net- works to send a call waiting indication if a call "of any kind" comes in during an active fax call, but others may (with the same settings active) indicate a waiting fax call during any kind of active call. Thus, the only reliable way to receive or prevent a call waiting indication under any circumstances and in any network, is to activate or deactivate call waiting for all tele- and bearer services (<class> 255).

Examples

EXAMPLE 1

Parameter <n>

 

at+ccwa=1

To enable the presentation of the URC

 

OK

 

 

 

 

EXAMPLE 2

 

 

Parameter <mode>

 

 

 

 

 

at+ccwa=,1

To activate the supplementary service in the network

 

 

for voice, data, and fax calls (default classes).

 

 

Note that Parameter <n> is left out. In this case, the

 

 

current value of <n> will be retained.

 

OK

 

 

at+ccwa=,2

To query the network status of call waiting for default

 

 

classes

 

at+ccwa=1,1

Call Waiting is activated during voice calls.

 

at+ccwa=1,2

Call Waiting is activated during data calls.

 

at+ccwa=1,4

Call Waiting is activated during fax calls.

 

OK

 

 

 

 

EXAMPLE 3

 

 

Parameter <class>

 

 

 

 

 

AT+CCWA=,0,1

To deactivate call waiting for voice calls.

 

OK

 

 

 

 

MC55_ATC_V01.05

Page 229 of 469

2/10/04

Confidential / Released

 

 

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Siemens MC55 manual At+ccwa=,1, At+ccwa=,2, At+ccwa=1,1, At+ccwa=1,2, At+ccwa=1,4, AT+CCWA=,0,1