Error code 16:
16 The link was terminated by the modem hanging up.
I got that from "man pppd" in console.
Does your ISP require something special? Try using Kppp and select "show log" so that it will tell you what it is doing.
Does it connect at all? Is your settings correct for your ISP?
I'm not to familiar with the ISP's you have in your country so maybe someone local will kick in here.
Hope that helps.