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Chapter 12 – No Prefix Commands

CDMA 1xEV-D0 AT Commands Reference Guide (Document S000482B) 46

D Dial

Syntax: ATD

Description: Initiates a data call. To dial a voice call, use +CDV.

Because of the options available in this command, another AT command cannot follow it

on the same line. All characters following the D command are taken as parameter options.

Several types of data calls are possible, based on the option(s) entered.

Packet Data Calls

Traditional CDMA data call dialing uses the parameter “#777”. This triggers the modem to

try a connection using the detected service type: 1X or QNC (IS-95). It is possible that 1X

service may be detected in an area that offers 1x voice service, but only IS-95 data

service. The use of passwords can differ between a QNC and 1X call on some networks

as well. In these situations the call is likely to fail.

You should force the modem to attempt one service type or the other by using dedicated

dial strings dictated by the carrier. Typically (but not in all cases) the strings are:

• #762 “QNC” – Connect to QNC using IS-95 service

• #19788 “1XRTT” – Connect PPP using 1X service

Your connection software must manage use of the correct password for the type of service

used.

Async (CSC) Data

The type of call opened depends on the setting of +FCLASS. The modem does not

actually dial the number in the string. For an IS-95 call, the dial string is passed to the IWF

where a modem there issues the dial over the PSTN. Prior to passing the dial command,

the modem sends the IWF modem the string defined in +CFG (Configuration String) to

configure the IWF modem for the call.

For dialing an async data call, the parameter string options are included on one command

line with or without spaces. There is a limit of 35 characters in the dial options string. Upon

successful answer and connection, the modem goes into data state. There is a time limit

set in register S7

(Wait for Carrier) for the entire process.

The options listed below are commonly supported, but specific IWF modem capabilities

govern the list of supported parameters.

Opt. Meaning

0 - 9 Any digit (0-9) (*, #, A, B, C, or D are also permitted). The phone number

may also include the formatting characters brackets ( and ), hyphen -, and

<space>. These characters are ignored.

T Tone (DTMF) dialing - ignored by the modem.

P Pulse dialing - ignored by the modem.

W Wait for dial tone before processing the remaining characters in the dial

string. The duration of the wait is limited by register S7 (Wait for Carrier).

, Pause before processing the remaining characters in the dial string. The

pause time is set by register S8 (Comma Pause Time).

$ Wait for billing (bong) tone before processing balance of string.

@ Wait for quiet answer; limited by register S7 (Wait for Carrier).

! Hook flash. Causes the modem to go on-hook briefly and then returns to off-

hook. This is used to access certain calling features on the PSTN.

Result Codes:

The possible result codes are determined by the call monitoring set by X[n] (Result Code

Select). See the table of possible result codes later in this manual.

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