Specifications

TC35i AT Command Set
Confidential / Released
TC35i_ATC_V01.05 Page 83 of 278 04.08.2003
Notes regarding <class>:
· The AT+CCWA command offers a broad range of options according to the
GSM specifications. However, when you attempt to set a <class> which is
not provisioned or not supported, the setting will not take effect regardless of
the response returned. The responses in these cases vary with the network
(for example “OK”, “Operation not allowed”, “Operation not supported” etc.).
To make sure check the current Call Waiting settings with <mode>=2.
· <class> 2 (data) comprises all those <class> values between 16 and 128,
that are supported both by the network and the MS. This means, a setting
made for <class> 2 applies to all remaining data classes (if supported). In
addition, you can assign a different setting to a specific class. For example,
you can activate Call Waiting for all data classes, but deactivate it for a spe-
cific data class.
· 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 implementation of the service.
For example, the activation of “call waiting” for <class> 4, “fax”, causes
some networks 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 reli-
able way to receive or prevent a call waiting indication under any circum-
stances and in any network, is to activate or deactivate call waiting for all
tele- and bearer services (<class> 255).
Unsolicited Result
Codes
If <n>=1 and the Call Waiting service is enabled the following URCs indicate a
waiting call to the TE:
+CCWA: <number>,<type>,<class>,,<CLI validity>
This URC appears while the waiting call is still ringing.
or
^SCWA:
This URC indicates that a waiting call rang when the ME was in online mode
during a CSD call, but the calling party hang up before the ME went to com-
mand mode.
Parameters of the URC +CCWA
<number> String type phone number of calling address in format speci-
fied by <type>
<type> Type of address octet in integer format (refer to GSM 04.08
subclause 10.5.4.7)
<class> Indicates the class of the waiting call. See Write command for
possible values.
<CLI validity> 0 CLI valid
1 CLI has been withheld
2 CLI is not available
If the active call is a CSD call, and a waiting call is received, then ME produces
a BREAK while still in online mode, and displays
· +CCWA URC
(
as above
)
when ME
g
oes back to command mode while the