User manual

Wavecom GSM Modem

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3. AT commands for Call Control

3.1. Dial command D

This AT command is used by the external application to establish a call.

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

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

command)

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

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

ASCII string : (the bearer may be selected before, if not a default bearer is

used)

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

The answer to the command is the following :

OK if the call succeeds, for voice call only

CONNECT <speed> if tthe call succeeds, for data call only, <speed>

takes the value negotiated by the GSM module.

BUSY if the called party is in communication

NO ANSWER if no hang up is detected after a fixed network

time-out

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 :