Establishing a voice call, Answering a circuit-switched data (csd) connection – Multi-Tech Systems MTCBA-E-U User Manual

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Chapter 3 – Using Your Wireless Modem

Multi-Tech Systems, Inc. MultiModem EDGE USB Wireless Modem User Guide

Establishing a Voice Call

• Enter PIN Code (if required by your wireless provider)

Type AT+CPIN=1234
Responses:

OK (PIN Code accepted)

+CME ERROR : 16 (Incorrect PIN Code)

+CME ERROR : 3 (PIN already entered [with +CMEE : 1 mode])

• Initiate a voice call

Type ATD1234; (Note: Don’t forget the semicolon “;” at the end. This stands for voice calls)
Responses:

OK (Communication established)
CME ERROR : 11 (PIN Code not entered [with +CMEE : 1 mode])

CME ERROR : 3 (Operation not allowed)

• Initiate an emergency call

Type ATD112; (Note: Don’t forget the semicolon “;” at the end. This stands for voice calls)
Responses: OK

• Hang up

Type ATH
Responses: OK

Establishing a Circuit-Switched Data (CSD) Connection

A Circuit-Switched Data Connection (CDC) makes the wireless modem work similar to a regular analog modem.
You must have CSD service in order to make a CSD call. Note that your wireless provider charges airtime usage
for these connections.

Note:

Your cellular provider charges airtime usage for these connections.

Establish a Connection:

Using HyperTerminal or a terminal application, you can establish a CSD
connection by entering the following command: ATD

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.

Disconnect:

Type:

+++

Wait about two seconds to see an OK response.

Then

type:

ATH

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:

Establish A Connection:

Call into the modem by dialing the data number provided by your carrier.

Answer a Call:

When you see the RING responses on the terminal screen, enter ATA to
answer the call.

Set Auto-Answer:

Enter ATS0=x

This sets the modem to auto-answer. The call will be answered after the number
of rings entered. x stand for the number rings.

Then call into the number provided to you by the carrier.