MC55 AT Command Set
9.7 AT+CCWA s
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MC55_ATC_V01.05 Page 228 of 469 2/10/04
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8SMS
16 Data circuit sync
32 Data circuit async
64 Dedicated packet access
128 Dedicated PAD access
1...[7]...255 Combination of some of the above classes. For example, the default setting 7
represents the sum of the integers 1, 2 and 4 (CF for voice, data and fax). The
value 255 covers all classes. If parameter "class"is omitted, the default value 7
is used.
0 Call waiting service is not active
1 Call waiting service is active
Phone number of waiting caller in the format specified by parameter <type of number>.
Type of address octet in integer format (refer to GSM 04.08, subclause 1 0.5.4.7)
145 <calling number> includes international access code character '+'
129 Otherwise
0 CLI valid
1 CLI has been withheld
2 CLI is not available
Notes
• If the active call is a CSD call, and a waiting call is received, then the ME produces a BREAK while still in
online mode, and displays
- the +CCWA URC (as above) when the ME goes back to command mode while the waiting call is still active
and can be accepted;
- or the ^SCWA URC (as above) when the ME goes back to command mode after the waiting call has
ended.
• With the AT+CHLD command, it is possible to establish a multiparty call or to set the active voice call on hold
and then accept a waiting voice call (not possible with fax and data call). See also AT+CHLD
• Users should be aware that if call waiting is activated (<mode>=1), the p resentation of URCs needs to be
enabled, too (<n>=1).
Otherwise, on the one hand, a waiting caller would be kept waiting due to lack of BUS Y signals, while, on the
other hand, the waiting call would not be indicated to the called party.
• The AT+CCWA command offers a broad range of options according to the GSM specifications. However,
when you attempt to enable call waiting for a <class> for which the service is not provisioned or not sup-
ported , the setting will not take effect regardless of the response returned. The responses in these cases va ry
with the network (for example "OK", "Operation not allowed", "Ope ration not supported" etc.). To make sure
<status>(num)
<calling number>(str)
<type of number>(num)
<CLI validity>(num)