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4.4
Call Control
4.4.1
ATA (Answer)
Description
Answer an incoming call.
This command is used to request the CM52 to answer an incoming call. The command returns "NO CARRIER"
if there is no call in progress.
Result Codes
OK
ERROR
NO CARRIER
4.4.2
ATH (Hook Control)
Description
Terminate an active call.
This command is used to request CM52 to terminate an active call. If there is no call in progress, the command
will be ignored but OK will still be returned.
If an incoming call is present, but not answered, ATH can be used to terminate the incoming call without
answering it first. Note that the behavior observed by the call originator may vary; Verizon will pass the call
immediately to voicemail when ATH is presented on the incoming call side.
4.4.3
ATD – Dial command
Description
Dial a call in Idle mode
This command instructs CM52 to originate (dial) a call if no call is already in progress. If a call is in progress,
the command is used for sending DTMF tones. Refer to section 4.4.4 for more information about DTMF tones.
For ATD to be used for voice call origination, the CM52 has to be in voice mode. It is possible to check what
mode the CM52 is currently in by issuing the "AT+COS?" Command. The first return parameter, Service code,
should be in the range of 0-3. For more information about the AT+COS command, see chapter 4.4.6.
All characters appearing on the same command line after the "D" are considered part of the call addressing
information to be signaled to the network, or as modifiers used to control the signaling process (collectively
known as a "dial string"), up to the end of the command line. Some characters may be included in the dial
string that the CM52 will skip (ignore) when encountered. This permits characters such as parentheses and
hyphens to be included that are typically used in formatting of telephone numbers.
The length of the <dial string> is between 1 and 32 valid characters (after skipped characters are parsed out).
Syntax
ATA
Description
The command was executed successfully.
The command was not executed successfully (no connection available).
There is no call in progress
Syntax
ATH
Syntax
ATD<dial_string>
Confidential
USERS MANUAL
Document number
1/198 17-4/FCP 101 3045 Uen
Possible responses
OK
Possible responses
OK
Possible responses
OK
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Revision
D
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