HUAWEI MG323 GSM M2M Module
AT Command Interface Specification Commands for Call Control
Issue 02 (2010-11-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd. 58
7 Commands for Call Control
This chapter describes the AT commands that are related to the calling and called
parties of the data service.
7.1 ATD - Command for Originating a Call
The ATD command originates a voice call or a CSD data service. For originating a
voice call, the command ends with ";". For establishing a data service connection, the
command ends without ";".
Execution
command
ATD<dialstring>[;]
Function Originates voice call or CSD data services.
Response When originating a voice call
z In case of successful execution: <CR><LF>OK<CR><LF>
z In case of an error: <CR><LF>ERROR<CR><LF>
or <CR><LF>+CME ERROR: <err><CR><LF>
z In case of failed link establishment: <CR><LF>NO
CARRIER<CR><LF>
or <CR><LF>NO ANSWER<CR><LF>
z If the called party is busy: <CR><LF>BUSY<CR><LF>
When establishing a CSD data service connection
z In case of successful execution:
<CR><LF>CONNECT[<text>]<CR><LF>
z In case of failure in establishing the connection: <CR><LF>NO
CARRIER<CR><LF>
z If the called party is busy: <CR><LF>BUSY<CR><LF>
Parameter description
<dialstring>: the telephone number of the called party. "1, 2, 3, 4, 5, 6, 7, 8, 9, 0, *, #,
+, A, B, C, D, P, T, W, @, !" are allowed for this parameter, but of which "T, P, D, !, @"
will be ignored.