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Custom Chat Scripts
Custom chat scripts can be used when the ISP dial-up server does not use PAP or CHAP as an
authentication protocol to control access. Instead, the ISP requires a user to log onto the dial-
up server by prompting for a user name and password before establishing the PPP connection.
For the most part, this type of server is part of the legacy systems rooted in the dumb terminal
login architecture. Because these types of servers can prompt for a user name and password
in a variety of ways or require subsequent commands to initiate the PPP connection, a Chat
Script field is provided for you to enter a custom script.
If a custom chat script is required by an ISP for establishing a connection, it is commonly found
on their web site or provided with their dial-up access information. Sometimes the scripts can
be found by using a search engine on the Internet and using the keywords, "chat script ppp
Linux <ISP name>".
A custom chat script can look like the following script:
ABORT 'NO CARRIER'
ABORT 'NO DIALTONE'
ABORT 'BUSY'
" ATQ0
" ATE0
" ATM1
" ATW2
" ATV1
OK ATDT\T
CONNECT "
sername: \L
ssword: \P
The script looks a lot like the previous script with the exception of the commands at the end.
There is an empty string (") after Connect which sends a carriage return command to the
server. The chat interpreter then waits for sername: substring. When a response is returned,
the current PPP account user name, substituting the \L command control string, is sent. Then,
the chat interpreter waits for the substring ssword:, and sends the password, substituting \P
with the PPP account password. If either the sername or ssword substring are not received
within the timeout period, the chat interpreter aborts the dial-up process resulting in a dial-up
failure.
Configuring the TELE3 SP Modem Connection Page 49
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