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Information on Chat Scripts
Some legacy servers can require company-specific chat scripts for logging onto the dial-up
servers.
A chat script, like other types of scripts, automates the act of typing commands using a
keyboard. It consists of commands and responses, made up of groups of expect-response pairs
as well as additional control commands, used by the chat script interpreter on the TELE3 SP.
The TELE3 SP uses a default chat script that works with most ISPs, but your ISP may require
a chat script with specific commands to "chat" with their server. If an ISP requires a specific
chat script, it is typically provided to you with your dial-up access information. The default chat
script for the TELE3 SP has the following commands:
ABORT 'NO DIALTONE'
ABORT 'BUSY'
ABOR 'NO CARRIER'
"ATQ0
"ATE0
"ATM1
"ATL0
"ATV1
OK ATDT\T
CONNECT \D \C
The first three commands are meant for the chat script interpreter directing it to abort if any
of the strings "NO CARRIER". "NO DIALTONE", or "BUSY" are received from the modem.
The next five commands are AT commands telling the chat interpreter to wait for nothing as
" defines an empty string, and configure the following on the modem: return command
responses, don't echo characters, report the connecting baud rate when connected, and return
verbose responses.
The next line has OK as the expected string, and the interpreters waits for OK to be returned
in response to the previous command, ATV1, before continuing the script. If OK is not returned
within the default time period of 50 seconds, the chat interpreter aborts the script and the
connection fails. If OK is received, the prefix and phone number of the selected dial-up account
is dialed. The \T command is replaced by chat script interpreter with the prefix and phone
number of the dial-up account.
In the last line of the script, Connect is the expected response from the remote modem. If the
modems successfully connect, Connect is returned from the TELE3 SP modem.The \D adds a
pause of one second to allow the server to start the PPP authentication. The \C command ends
the chat script end without sending a carriage return to the modem. The TELE3 SP then
attempts to establish a PPP (Point-to-Point Protocol) connection over the serial link. The PPP
connection usually includes authentication of the user by using PAP (Password Authentication
Protocol) or CHAP (Challenge Handshake Authentication Protocol) from the PPP suite. Once a
PPP connection is established, it looks like any other network interface.
Page 48 SonicWALL TELE3 SP Installation Guide
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