Specifications

AT command set for XX Siemens mobile phones and modems

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Document No.: A30880-A10-A001-XX-

D376

Revision: Master R75

Revision Date: 29. September, 2004

<cid> 1-3

PDP context identifier

Notes for GPRS calls:

1) The ATD command for GPRS always includes an attach if the mobile is currently detached. The attach

may last for some time (up to 60 seconds). During attach the command is interruptible

2) If no <cid> is given in the ATD command a predefined PDP context without an Access Point Name is

used for dialing. But maybe it is demanded by the network operator so the dial fails and issues an error

message.

3) It is not possible to use a <cid> which is already active for the ATD command.

2.2.4 Command combinations to be avoided

It is possible to specify more than a single command in the command line at any one time; however, not all

command combinations will have the expected result. To ensure that responses to commands will be displayed in

the order expected, the following command combinations should be avoided:

• General commands according to ITU-T Recommendation V.250 combined with Fax commands

• General commands according to 3GPP TS 27.007 combined with Siemens defined commands

• General commands according to 3GPP TS 27.005 specified stand-alone

2.3 AT commands and responses according to 3GPP TS 27.007

According to 3GPP TS , it is possible to execute an AT command in any of the following forms:

Test command AT+CXXX=? The mobile phone or modem responds by sending the list of

parameters and value ranges; these can be set using the

corresponding Write command or by means of internal processes

Read command AT+CXXX? This command displays the current value setting of the

parameter(s).

Write command AT+CXXX=<...> This command is used to set parameters that can be set.

Execute command AT+CXXX This command reads non-settable parameters which are

influenced by internal processes in the mobile phone or modem

Table 2-8: Conventions applying to the presentation of AT commands

2.3.1 General commands according to 3GPP TS 27.007

This section provides the descriptions of general 3GPP TS 27.007 commands [10].

ATO

ATO Return to online data state

Execute command

Response

ATO

CONNECT/ NO CARRIER/ERROR

AT+CGMI

AT+CGMI Issue manufacturer ID code

Test command Response:

AT+CGMI=?

Execute command Response