3 defined values, 4 syntax to send and receive ussd, 5 defined values to send and receive ussd – Rainbow Electronics 900 User Manual
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10.11.3 Defined values:
<n>
0: Disable the result code presentation
1: Enable the result code presentation
2: Cancel session (not applicable to read command response)
<m>
0: no further user action required (network initiated USSD-Notify, or no further information needed after
mobile initiated operation)
1: further user action required (network initiated USSD-Request, or further information needed
after mobile initiated operation)
2: USSD terminated by network
4: Operation not supported
<str>: network string (name), converted in the selected character set
<dcs> : the data coding scheme received (GSM TS 03.38).
10.11.4 Syntax To send and receive USSD:
Command syntax: AT+CUSD= <n> [,<str> [,<dcs>]]
Note : Please, be aware that the send USSD command needs the user to re-enter the <n> parameter !
10.11.5 Defined values To send and receive USSD :
<str> is the USSD string to be sent.
<dcs> the default alphabet and the UCS2 alphabet are supported.
When the product sends a USSD, an OK response is first returned, and the intermediate +CUSD indication
comes subsequently.
In case of error, a “+CUSD:4” indication is returned.