Westermo GS-01 User Manual download pdf (Page 9)

96195-2201

Call control commands

D – Dial command

Command syntax: ATD <Numb> [I / i] [G/g] [;]

ATD> <PhbStr> [I / i] [G/g] [;]

ATD> mem <n> [I / i] [G/g] [;]

ATD> <PhbIndex> [I / i] [G/g] [;]

The ATD command is used to establish a speech, data or fax call.

For a data or fax call, the application sends to the GSM module the following ASCII

string: (the bearer has to be selected before with the +CBST command)

ATD<nb> where <nb> is the called phone number.

For a voice call, the application sends to the GSM module the following ASCII string:

(the bearer has to be selected before, if not a default bearer is used)

ATD<nb>; where <nb> is the called phone number.

Please, notice that in case of international number, the local international prefix has not

to be set (usually 00) but need to be replaced by the ”+” character.

Example: to establish a voice call to Wavecom from another country,

the AT command shall be:

ATD+33146290800;

Notice that some countries can have particular numbering rules for their GSM handset

numbering.

The answer to the ATD command can be one of the following ones:

Verbose result code Numeric (V0 set) Description

OK 0 if the calls succeeds, for voice

call only

CONNECT <speed> 10,11,12,13,14,15 if the calls succeeds, for data calls

only, <speed> takes the value

negotiated by the GSM module

BUSY 7 if the called party is already in

communication

NO ANSWER 8 if no hang up is detected

after a fixed network time-out

NO CARRIER 3 Call setup failed or remote user

release. Use the AT+CEER

command to know the failure

cause

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Westermo GS-01 User Manual Page 9