SBS2003 DUN Configuration requirement

I am a newbie to SBS2003 standard edition (last contact with severs was
original NT!) but I am IT literate and competent . I have installed a
small network for a customer/fiend and I have used the wizard to set up the
Internet and email. I am using dialup as a temporary measure until DSL
becomes available. I want to configure the DUN so that it will disconnect
the server if idle for more than 2 minutes and I also want the connection
icon to appear in the systray when connected. How do I do it please. Line
costs(in UK) are expensive and I do not want to resort to asking the customer
to pull the cord from the socket when he wants to disconnect!

Thanks in adavaqnce for your assitance.

Jon