Establishing A Circuit-Switched Data (Csd) Connection; Answering A Circuit-Switched Data (Csd) Connection - Multitech MultiModem MTCBA-G-F4 User Manual

To initiate an emergency call:
3.
a. Type ATD112; (Note: Don't forget the semicolon ";" at the end, which indicates voice calls)
b. Responses include:
OK
To hang up:
4.
a. Type ATH
b. Responses include:
OK

Establishing a Circuit-Switched Data (CSD) Connection

A Circuit-Switched Data Connection makes the wireless modem work similar to a regular analog
modem. You must have CSD service in order to make a CSD call.
Note: Your wireless service provider charges airtime usage for these connections.
Establishing a Connection
Use HyperTerminal or a terminal application, type the following command:
1.
ATD<phone number>
Notes:
The phone number you are calling is entered between the displayed brackets. Do not type
●
additional brackets. For example, type only ATD 8585551212. 8285551212 is typed between the
brackets.
This command tells the modem to inform the wireless network that you are initiating a CSD
●
modem call. If you are dialing to another modem, the remote modem should answer and a
connection between the two modems will be established. If you include a semi-colon (;) at the
end of the dialing string, the modem will instead initiate a Voice call to the phone number
dialed.
Disconnecting
To disconnect, type:
1.
Wait about two seconds to see an OK response.
2.
Then type: ATH
3.
Note: +++ is the escape sequence and ATH is the Hang-up command.

Answering a Circuit-Switched Data (CSD) Connection

A Circuit-Switched Data Connection makes the wireless modem work similar to a regular analog
modem. You must have CSD service in order to answer a CSD call.
There are three phone numbers for GSM: the voice number, the data number, and the fax number. All
are provided by the carrier.
To answer a call:
To establish a connection, call into the modem by dialing the data number provided by your carrier.
1.
To answer a call, when you see the RING responses on the terminal screen, enter ATA <cr>.
2.
To set auto-answer, enter ATS0=x
3.
Multi-Tech Systems, Inc. MultiModem GPRS Wireless Modem User Guide
+++
Chapter 3 – Using Your Wireless Modem
19