User guide

Developers guidelines | AT commands
35 June 2010
ATD Dial command (ver. 5)
Description: Initiates a phone connection, which may be data or voice (phone number
terminated by semicolon). The phone number used to establish the con-
nection consists of digits and modifiers or a stored number specification.
It is also possible to initiate a phone connection with the use of the alpha-
numeric field for a phonebook entry location or by the use of the entry
location, <n>, itself.
AT+CPBS is the recommended command to select memory storage.
Note: Only phone and SM (SIM Memory) storage are supported by ATD.
If the dial string is followed by a semicolon, this informs the phone that the
number is a voice rather than a data number.
If the dial string is omitted but the semicolon included the command
instructs the phone to do a network detect. If the network is available,
“OK” is returned.
Aborting an ATD command is accomplished by the transmission from the
DTE to the DCE of any character. A single character is sufficient to abort
the command in progress. However, characters transmitted during the first
125 milliseconds after transmission of the termination character are
ignored to allow for the DTE to append additional control characters, such
as line feed after the command line termination character.
Execution
command: ATD[<dial_string>][I][G][;]
Originates a call and dials the phone number specified in the command as
<dial_string> or does a network detect.
ATD>ME<n>[I][G][;]
Dials the phone number stored in phone memory and is located by the
index <n>.
ATD>SM<n>[I][G][;]
Dials the phone number stored on the SIM card and is located by the index
<n>.
ATD>LD<n>[I][G][;]
Dials the phone number stored in the Last dialled number list on the SIM
card and is located by the index <n>. The most recently dialled number is
assumed to have <n>=”1”.
ATD><str>[I][G][;]
Originates a call to the phone number corresponding to the alphanumeric
field <str>. If possible, all available memories are searched for the correct
entry.