Click Start, then right click MY Network Places,click Properties,click Advanced, click Dial Up Preferences, click Enable Auto Dial by Location, Uncheck All Locations, Check Always Ask Me Before Auto Dialing, check Disable Auto Dial While I am logged On, In the Enable Auto Dial by Location Box select each location for which you want Auto Dialing Feature to Operate. REBOOT
If that don't do it, you are going to have to enter registry and disable some dialing. However you need to wait for Someone named Patio, Broni or some other Moderator/Mentor to drop by.
I do some stuff in my registry as needed but would never advise someone else, Too much can go wrong.