VoiceChat is a simple VoIP application written in Java that supports uPnP, conversations with multiple users and basic compression with comfort noise.
Download from my site (Requires Java)
If you want to play with the code, just import the projects into Netbeans
Multiplaform, Java SE 7
Copyright (C) 2015 Federico Dossena
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.