Specifications

Chapter 7 – Call-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371B) 76
Parameter Description:
<n>
String of dialing digits and optional V.250 modifiers: 0-9, *, #, +, A, B, C
The following V.250 modifiers are ignored: ,(comma), T, P, !, W ,@
Emergency call : <n> = 112, 911 or 08, standardized GSM emergency number (no SIM needed).
<mgsm>
String of GSM modifiers:
I Activates CLIR (disables presentation of own phone number to called party)
i Deactivates CLIR (enables presentation of own phone number to called party)
G Activate Closed User Group explicit invocation for this call only.
g Deactivate Closed User Group explicit invocation for this call only.
Notes:
• The command may be aborted generally when receiving a character during execution. It cannot be aborted in
some connection setup states, such as handshaking.
• Parameter “I” and “i” only if no *#-code is within the dial string.
• <mgsm> is not supported for data calls.
• <n> is default for last number that can be dialled by ATDL.
• See also ATX for <text>.
• If ATD is used with a USSD command (e.g., ATD*100#;) an AT+CUSD=1 is executed implicitly (see AT+CUSD).
• Parameter ‘G’ or ‘g’ will be ignored if Closed User Group was already activated, respectively deactivated with
AT+CCUG command before. Call by call invocation of CUG uses the settings provisioned by the provider or, if
available, the settings of the parameters <index> and <info> made with AT+CCUG.
• The ME is equipped with a “Blacklist” function according to GSM02.07 Annex A:
After a predefined number of failed call attempts, the dialed number is entered into a read-only phonebook called
“blacklist” (phonebook “BL”). Call attempts to numbers contained in the blacklist will be barred by ME and not
signalled to the network.
An attempt to start a voice call to a barred phone number will be stopped with a CME ERROR 257 “Call Barred”.
An attempt to start a data or fax call to a barred phone number will be answered immediately with result code
“NO CARRIER”.
The barred numbers are automatically removed from the blacklist according to the timing conditions specified in
GSM02.07 Annex A.
Example:
The following example shows the call setup procedure when a call is already active and a second call attempt fails
because the line of the called party is busy:
atd03012345678 Dialing out the first party’s number.
OK The first call is established.
ATD03022222222 The number of the second party is dialed.
OK The response “OK” is issued immediately though no call is established
(same behavior as is you had chosen AT^SM20=0.)
BUSY Line of the second called party is busy.