Provides a interface to Microsof Remote Access Servicenetworking incluing modem
Java dial-up API
Release notes for version 2.5.

JDialUp API 2.5 - Java API that provides a friendly interface to Microsoft芒?垄 Remote Access Service (RAS) networking including modem, broadband, VPN and other connections. See javadoc.
JDialUp API gives you all the neccessary functionality to:
Create, delete, edit, rename entry
dial entry (with or without Notifications of the dialing state)
hang up the specified connection you can free download JDialUp API 2.5 now.