Siemens MC55 - Manual (Page 229)

MC55 AT Command Set
9.7 AT+CCWA
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MC55_ATC_V01.05 Page 229 of 469 2/10/04
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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>
EXAMPLE 2
Parameter
<mode>
EXAMPLE 3
Parameter
<class>
at+ccwa=1
To enable the presentation of the URC
OK
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
AT+CCWA=,0,1
To deactivate call waiting for voice calls.
OK