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Chapter 5 – Call Control Commands
Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 23
Automatic Dialing with DTR %D
Description: This command enables and disables:
• Automatic dialing of the phone number stored in the first location of the ADN phonebook, (or
FDN phonebook, if it is activated using the +CLCK command).
• Automatic sending of the short message (SMS) stored in the first location of the SIM.
The number is dialed when the DTR OFF switches ON.
The short message is sent when DTR OFF switches ON.
Values: <n> (0-2) Enables or disables automatic message transmission or number dialing. Informs the
product that the number is a voice number rather than a data number.
%D0 Disables automatic DTR number dialing / message transmission.
%D1; Enables automatic DTR dialing if DTR switches from OFF to ON. Dials the phone number
in the first location of the ADN phonebook (or FDN phonebook, if it is activated using the
+CLCK command). Voice call with semicolon.
%D1 Activates automatic DTR dialing if DTR switches from OFF to ON. Dials the phone
number in the first location of the ADN phonebook (or FDN phonebook, if it is activated
using the +CLCK command). Data call without semicolon.
%D2 Activates automatic DTR message transmission if DTR switches from OFF to ON. Sends
the short message in the first location of the SIM.
Note: If the first location is empty:
• AT%D1 and AT%D2 commands will receive an OK response.
• The DTR ON event will trigger a CME ERROR: 21 or a CMS ERROR: 321
Syntax: Command Syntax: AT%D<n>[;]
Command Possible responses
AT%D1;
Note: Activates DTR number dialing
OK
Note: Command has been executed
DTR is OFF
DTR switches ON
Note: Number in the ADN’s first location is dialed automatically
DTR switches OFF
Note: The product goes on-hook
OK
AT%D2
Note: Activates DTR short message sending
OK
Note: Command has been executed
DTR is OFF
DTR switches ON
Note: The first short message is being sent
+CMSS: x
AT%D1; OK
DTR is OFF
DTR switches ON
Note: No phone number in the ADN phonebook’s first location
(or FDN phonebook if it’s activated using the +CLCK command)
+CME ERROR: 21
AT%D2; OK
DTR is OFF
DTR switches ON
Note: No short message in the first location of the SIM
+CME ERROR: 321
Automatic Answer S0
Description: This S0 parameter determines and controls the product automatic answering mode.
Values: <value> The number of rings before an automatic answer (3 characters padded with zeros)
Range of values is 0 to 255.
Syntax: Command Syntax: ATS0=<value>
Command Possible responses
ATS0=2
Note: Automatic answer after 2 rings
OK
ATS0?
Note: Current value
002
OK
Note: always 3 characters padded with zeros
ATS0=0
Note: No automatic answer
OK
Note: Command valid
All others S-parameters (S6,S7,S8 …) are not implemented.