Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 534)

Supplementary Services Commands
Call Waiting +CCWA
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WM_DEV_OAT_UGD_049 - 001 VOLUME 3 August 23, 2007
20.9 Call Waiting +CCWA
20.9.1 Description
This command allows to control the call waiting supplementary service.
The product will send a +CCWA unsolicited result code when the call waiting service
is enabled.
20.9.2 Syntax
Action command
AT+CCWA=<n>,[<mode>[,<class>]]
[+CCWA:<status>,<class>[…]]
OK
Read command
AT+CCWA?
+CCWA: <n>
OK
Test command
AT+CCWA=?
+CCWA: (list of supported <n>s)
OK
Unsolicited response
+CCWA: <number>,<type>[,<class>][,<alpha>]