I'm using GKdial to connect to the internet.

It makes the standard sounds when I connect.

How do I turn off the modem speaker?

I don't know about GKdial
but if you use wvdial then add
ATM0L1 or ATM0

in its init1 option

TIMEOUT 60
ABORT ERROR
ABORT BUSY
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
"" "AT&FH0 M0 L0"
OK "atdt8851568"
TIMEOUT 75
CONNECT

This is my /etc/ppp/pppscript file.

I added the M0 L0 commands and it turned off the modem speaker, but only when I type ppp-go at the command prompt, not when I use GKdial.

GKdial must have it's own configuration file. I wonder where it is?

http://support.real-time.com/linux/dialup/wvdial.html

I'll study wvdial for a while.

if GKdial is a frontend then it will be there in its properties somewhere, you don't have to edit its configuration file because it is made to edit that configuration file .

Doing everything as root with M0 L0 in the pppscript file or just M instead of M0 L0:

GKdial runs /usr/bin/pon and the modem volume is loud when it connects.

pon at the command prompt doesn't work, it wants more parameters, but pon ispname works at the command line (volume still loud). poff works at the command line.

At the command prompt ppp-go makes the connection silently.

I put /usr/sbin/ppp-go in the GKdial conneciton command window and it didn't work.

How do I make a silent connection with GKDial? Why would it be silent with ppp-go, but not with pon from GKDial?

I got it working. I added the line OK ATM0 to /etc/chatscripts/ISPprovider.

pon runs the chatscript and the ATM0 command sets the modem volume to zero.

ABORT RING
ABORT BUSY
ABORT "NO CARRIER"
ABORT VOICE
ABORT "NO DIALTONE"
ABORT "NO ANSWER"
"" ATZ
OK ATM0
OK ATDTphonenumber
CONNECT \d\c