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Chapter 3 - AT Commands

$ Call Card Tone Detect

Use the $ command to dial services that require you to enter your call card number after a

tone. A $ character in the dialing string causes the modem to pause and wait for an AT&T

call card “bong” or a 1600 Hz tone (prevalent in the U.K.). When the modem detects the

tone, it processes the rest of the dialing string. If it does not detect a tone within the time set

by register S7 (a 45-second default), the modem aborts with a NO CARRIER message.

Pressing any key also aborts the $ command.

In the following example, the $ command is placed between an access/phone number and

the caller’s credit card number:

ATDT1028806127853500

$123456789

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Multitech MT2834MR6 Guida Utente Pagina 29