Specifications

3GPP

3GPP TS 27.007 V6.3.0 (2003-

06)

Release 6

+CUSD=?

+CUSD: (list of supported <n>s)

Description

This command allows control of the Unstuctured Supplementary Service Data (USSD) according to 3GPP TS

22.090 [23]. Both network and mobile initiated operations are supported. Parameter <n> is used to disable/enable the

presentation of an unsolicited result code (USSD response from the network, or network initiated operation) +CUSD:

<m>[,<str>,<dcs>] to the TE. In addition, value <n>=2 is used to cancel an ongoing USSD session.

When <str> is given, a mobile initiated USSD-string or a response USSD-string to a network initiated operation is

sent to the network. The response USSD-string from the network is returned in a subsequent unsolicited +CUSD result

code.

NOTE: In case of successful mobile initiated operation, TA implemented according to a version prior to 6 of this

standard, waits the USSD response from the network and sends it to the TE before the final result code.

This will block the AT command interface for the period of the operation. Such TA does not support <n>

value 2.

The interaction of this command with other commands based on other GSM/UMTS supplementary services is described

in the GSM/UMTS standards.

Test command returns values supported as a compound value.

Defined values

<n>:

disable the result code presentation to the TE

1 enable the result code presentation to the TE

2 cancel session (not applicable to read command response)

<str>: string type USSD-string (when <str> parameter is not given, network is not interrogated):

- if <dcs> indicates that 3GPP TS 23.038 [25] 7 bit default alphabet is used:

- if TE character set other than "HEX" (refer command Select TE Character Set +CSCS): MT/TA

converts GSM alphabet into current TE character set according to rules of 3GPP TS 27.005 [24]

Annex A

- if TE character set is "HEX": MT/TA converts each 7-bit character of GSM alphabet into two IRA

character long hexadecimal number (e.g. character Π (GSM 23) is presented as 17 (IRA 49 and 55))

- if <dcs> indicates that 8-bit data coding scheme is used: MT/TA converts each 8-bit octet into two IRA

character long hexadecimal number (e.g. octet with integer value 42 is presented to TE as two characters

2A (IRA 50 and 65))

<dcs>: 3GPP TS 23.038 [25] Cell Broadcast Data Coding Scheme in integer format (default 0)

<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

other local client has responded

operation not supported

network time out