BGS2T AT Command Set
7.3 ATD
BGS2T_ATC_V01.301 Page 139 of 554 1/31/12
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7.3 ATD Mobile originated call to specified number
Syntax
Command Description
This command can be used to set up outgoing voice, data or fax calls. It also serves to control Supplementary
Services. The termination character ";" is mandatory to set up voice calls or to send *# codes for Supplementary
Services. It must not be used for data and fax calls.
Additional notes on the responses returned after dialing with ATD:
• For voice calls, you have the choice of two different response modes that can be selected with AT^SM20:
AT^SM20=1 (factory default) causes the ME to respond once the call setup is completed either successfully
("OK") or unsuccessfully ("NO CARRIER", "NO DIALTONE", "BUSY").
AT^SM20=0 causes the ME to return "OK" immediately after dialing was completed (i.e. before call setup ter-
minates successfully or unsuccessfully).
• For data connections, call setup always terminates when the call has been established (indicated by the result
code "CONNECT <text>"), or when it fails (indicated by "NO CARRIER"). The settings of AT^SM20 do not
apply.
Different call release indications:
• Upon termination, an outgoing fax or data call may show a different result code than a voice call would show
under identical conditions. In order to track down the actual reason for call termination, AT+CEER or ATS18
should be used for all applicable connections.
Using ATD during an active call:
• When a user originates a second voice call while there is already an active voice call, the first call will auto-
matically put on hold. The second call attempt is acknowledged with "OK" immediately after dialing with ATD
has completed, without relation to a successful call setup. In case of failure, the additional result codes "NO
CARRIER", "NO DIALTONE", "BUSY" will be presented afterwards (see example below).
Exec Command
ATD<n>[<mgsm>][;]
Response(s)
If no dialtone (parameter setting ATX2 or ATX4):
NO DIALTONE
If busy (parameter setting ATX3 or ATX4):
BUSY
If a connection cannot be set up:
NO CARRIER
NO DIALTONE
If successfully connected and non-voice call (TA switches to online data mode):
CONNECT <text>
When TA returns to command mode after call release:
OK
If successfully connected and voice call:
OK
PIN ASC0 MUX1 MUX2 MUX3 Last Reference(s)
± + + ± ± - - V.250
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