Modem Emulator - Supplementary Services

The AT commands in this section are used for accessing GSM supplementary services such as call waiting, caller-id, etc.

AT+CCFC Call Forwarding

The AT+CCFC command allows control of the call forwarding supplementary service according to 3GPP TS 22.082.

Defined Values:

Conforms with: 3GPP TS 27.007.

AT+CLIR Calling Line Identification Restriction

This command allows a calling subscriber to enable or disable the presentation of the CLI to the called party when originating a call.

The <n> parameter sets the adjustment for outgoing calls, and can be 0 (default; according to CLIR subscription), 1 (invocation), or 2 (suppression).

The <m> parameter shows the subscriber CLIR service status in the network. It can be one of:

Conforms with: 3GPP TS 27.007.

AT+COLP Connected Line Identification Presentation

This command enables a calling subscriber to get the line identity of the called party after setting up a mobile originated call. The command enables or disables the presentation of the connected line identity at the TE.

In this implementation of AT+COLP the line identity information is presented after the establishment of any type of call.

The <n> parameter can be 0 (default; disable) or 1. The <m> parameter shows the subscriber COLP service status in the network. See 27.007 for complete details.

Conforms with: 3GPP TS 27.007.

AT+CUSD Unstructured Supplementary Service Data

The AT+CUSD command allows control of the Unstructured Supplementary Service Data (USSD).

The <n> parameter can take the following values:

• 0 Disable result code presentation to TE (default)
• 1 Enable result code presentation to TE
• 2 Cancel session (not applicable to read command response)

When <str> is given, a mobile initiated USSD string is sent to the network. The response USSD string from the network is returned in a subsequent unsolicited +CUSD result code.

The <dcs> parameter defines the Cell Broadcast Data Coding Scheme in integer format (default 0).

The unstructured supplementary service data response is of the form +CUSD: <m>[,<str>,<dcs>] where <m> can take the following values:

• 0 No further user action required
• 1 Further user action required
• 2 USSD terminated by network
• 3 Other local client has responded
• 4 Operation not supported
• 5 Network time-out

Conforms with 3GPP TS 27.007.

AT+CCWA Call Waiting

The AT+CCWA command allows control of the Call Waiting supplementary service according to 3GPP TS 22.083.

    +CCWA: <status>,<class1>
    +CCWA: <status>,<class2>
    ...

Activation, deactivation, and status query are supported. When querying the status of a network service (<mode>=2) the response line for the "not active" case (<status>=0) should be returned only if the service is not active for any <class>.

Parameter <n> is used to disable/enable the presentation of an unsolicited result code +CCWA: <number>,<type>,<class>,[<alpha>][,<CLI validity>[,<subaddr>,<satype>[,<priority>]]] to the TE when the call waiting service is enabled.

Test command returns the supported unsolicited presentation values.

Conforms with: 3GPP TS 27.007.

AT+CLIP Calling line identification presentation

The AT+CLIP command allows control of the calling line identification presentation supplementary service.

Set command enables or disables the presentation of the CLI at the TE. It has no effect on the execution of the supplementary service in the network. When <n> is 1, the unsolicited response +CLIP: <number>,<type>[,<subaddr>,<satype>[,[<alpha>][,<CLI validitity>]] is sent to the TE after every RING or +CRING response.

Read command gives the status of <n>, plus the provision status of the CLIP service (<m>).

Conforms with: 3GPP TS 27.007.

AT+CSSN Supplementary Service Notifications

The AT+CSSN command refers to supplementary services related network initiated notifications. It controls the presentation of notification result codes from TA to TE.

<n> parameter enables presentation of the +CSSI result code to the TE. <m> parameter enables presentation of the +CSSU result code to the TE. For each, values of 0 (disable; default) and 1 (enable) are supported.

Conforms with: 3GPP TS 27.007.

[Previous: Modem Emulator - Network] [Next: Modem Emulator - GPRS]