AT Commands Reference Manual - wireless netcontrol GmbH

Chapter 3: AT Commands Reference
result in receiving the message "CONNECT" and the mode is changed to data mode; failure will
result in receiving the message “NO CARRIER” indicating call is released.
When answering a voice call successful answer will result in receiving the message "OK"; failure
will result in receiving the message “NO CARRIER” indicating call is released.
Dialing to an Electronic Telephone Service
When dialing to an electronic telephone service such as telephone banking, you must typically
instruct the modem to dial a number, then to wait for call establishment, and then send the
password for entering the banking account. A typical dial command might look like this:
ATD876-5555,1234,,56;
The modem dials the number `5555', it then wait for the call connection. The 1st comma in the
dial string indicates this request. The rest of the digits after the `,' will be sent as DTMF tones.
Other colons after the 1st one will be considered pause mark with a constant value. A longer
pause can be created by several commas. The constant value of the comma time length can be
configured using the S-register S8.
Circuit Switched Voice and Data Call Interaction
The following table shows the voice and data call interaction.
RAT Active Call Interrupt Result
X CS Voice MO CSD call MO CSD is rejected.
X CSD MO CS voice call (not
emergency)
X CSD MO emergency voice
call
MO CS voice call is rejected.
CSD is released and CS Data and Voice
interaction emergency call is established.
3G CSD Incoming CS voice Waiting call is rejected.
3G CS Voice Incoming CSD Waiting call is rejected.
2G CSD Incoming CS voice CS voice is alerting and can be answered.
2G CS Voice Incoming CSD CSD is alerting but can't be answered.
Call Control AT Commands
D, Dial Command
This command places a FAX/DATA/VOICE call on the current network.
The default call type is a data call (CSD). If the +FCLASS command was used to set the call type
to be FAX, then the outgoing call is a fax call.
There must be an explicit request in order to make a VOICE call. This request bypasses the
+FCLASS setting.
April 15, 2010 H24 - AT Commands Reference Manual 3-11