I see two possible problems with your /etc/wvdial.conf. I suggest that you try the following two changes, but only one change at a time.
You have baud= specified twice. This may mess up speed autodetect to where your modem and the ISP modem never agree as to the speed they are running. Change Baud = 57600 to
Baud = 115200 and throw out the Baud = 115200 in the [Dialer Defaults] section.
The second thing to try is to put
Stupid Mode = 1
in the [Dialer Defaults] section. Stupid Mode is used when your ISP has a slightly different logon procedure than normal. Turning on Stupid Mode tells pppd not to worry about it, just go ahead as if everything worked OK.
Here is a HOWTO that may help you.
http://cc.jlab.org/docs/services/linux/linux-ppp.html
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Steve Stites