Basic Modem Chat Script (System Administration Guide: Network Services)

System Administration Guide: Network Services

Basic Modem Chat Script

The following is a basic chat script that you can use as a template for creating your own chat scripts.

ABORT   BUSY
ABORT   'NO CARRIER'
REPORT  CONNECT
TIMEOUT 10
"" AT&F1M0&M5S2=255
SAY     "Calling myserver\n"
TIMEOUT 60
OK      "ATDT1-123-555-1212"
ogin: pppuser
ssword: \q\U
% pppd

The next table describes the contents of the chat script.

Script Contents	Explanation
`ABORT BUSY`	Abort transmission if the modem receives this message from the opposite peer.
`ABORT 'NO CARRIER'`	Abort transmission if the modem reports `ABORT 'NO CARRIER'` when dialing. The cause for this message is usually a dialing or modem negotiation failure.
`REPORT CONNECT`	Gather the `CONNECT` string from the modem. Print the string.
`TIMEOUT 10`	Set initial timeout to 10 seconds. The modem's response should be immediate.
`"" AT&F1M0&M5S2=255`	`M0` – Turn off the speaker during connect. `&M5` – Make the modem require error control. `S2=255` – Disable the TIES “+++” break sequence.
`SAY "Calling myserver\n"`	Display the message `Calling myserver` on the local machine.
`TIMEOUT 60`	Reset the timeout to 60 seconds to allow more time for link negotiation.
`OK "ATDT1-123-555-1212"`	Call the remote peer by using the phone number 123-555-1212.
`ogin: pppuser`	Log in to the peer by using UNIX-style login. Supply the user name `pppuser`.
`ssword: \q\U`	`\q` – Do not log if debugging with the `-v` option. `\U` – Insert in this location the contents of the string that follows `-U`, which is specified on the command line. Usually, the string contains the password.
`% pppd`	Wait for the % shell prompt, and run the `pppd` command.