Siemens Brodersen MC55 AT Command Manual page 205

Examples
EXAMPLE 1
Parameter
<n>
at+ccwa=1
OK
EXAMPLE 2
Parameter
<mode>
at+ccwa=,1
OK
at+ccwa=,2
at+ccwa=1,1
at+ccwa=1,2
at+ccwa=1,4
OK
EXAMPLE 3
Parameter
<class>
AT+CCWA=,0,1
OK
MC55_ATC_V04.00
Confidential / Released
To enable the presentation of the URC
To activate the supplementary service in the network for voice, data,
and fax calls (default classes).
Note that parameter
<n>
will be retained.
To query the network status of call waiting for default classes
Call Waiting is activated during voice calls.
Call Waiting is activated during data calls.
Call Waiting is activated during fax calls.
To deactivate call waiting for voice calls.
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is left out. In this case, the current value of
<n>
3/17/06