3.4.55. AT+CCWA - Call Waiting
This command allows control of the supplementary service Call Waiting. Activation,
deactivation and status query are supported.
AT+CCWA=[<n>[,<cmd>[,<class>]]]
Set command allows to enable/disable of the presentation of the URC to
the TE when call waiting service is enabled; it also permits to activate,
deactivate and query the status of the call waiting service.
The URC has the following format:
+CCWA: <number>,<type>,<class>[,<alpha>][,<cli_validity>]
Parameters: