MC55 AT Command Set
9.7 AT+CCWA s
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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 unifor mly among all networks:
GSM 02.04, Annex A, provides the following specification:
"The applicability of call waiting refers to the telecommunication service of the activ e 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 an y 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