AT Commands Phone Terminal Terminated
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4.2.1 Commands
ATA
Answer Incoming Call Command
ATH
Hook Control
ATD
Dial Command
ATL
Monitor Speaker Loudness
4.2 Ensemble C3: Call Control
Description:
Answers an incoming call.
Execution command:
ATA
Description:
Terminates an active call.
Execution command:
ATH
Description:
Causes the phone to dial a call.
All characters appearing on the same command line after the “
D
” are considered part of
the call-addressing information to be signalled to the network, or modifiers used to
control the signalling process (collectively known as a “dial string”), up to a semicolon
character or the end of the command line. The DCE dials the voice number to
complete the call, returns to the on-line command state, and sends an
OK
final result
code.
Any characters appearing in the dial string that the DCE does not recognise as a valid
part of the call-addressing information or as a valid modifier is ignored. This permits
characters such as parentheses and hyphens, that are typically used in formatting of
telephone numbers, to be included.
Execution command:
ATD
<dial_string>;
Parameter:
<dial_string>:
Valid characters: ‘0-9, #’
Possible responses:
NO DIALTONE
The line is busy.
ERROR
If ATD is unsuccessfully executed by the phone.
NO CARRIER
The mobile phone is not registered.
Description:
This command controls the volume of the monitor speaker.
Set command:
ATL=
[<value>]
Read command:
ATL?
Displays the current <value> setting.