Investigators said his email account was used to set up the "voiceoverInternet" system - which allows calls to be made over the web.
调查者说，他的邮箱帐号曾用来建立“网络呼声”系统——可以在互联网上打电话。
2
Figure 4 shows a chat UI that has several plug-in enhancements, such as an icon to launch conversations through voice chat, using voiceOverInternet Protocol (VoIP).
图4展示了一个具有若干插件功能增强的聊天ui，例如，其中的一个图标利用Voice Over Internet Protocol (VoIP)，可启动该图标进行语音聊天。
3
Many call centres, for instance, use voice-over-internet technology so that international calls can be handled more cheaply than with high-quality voice lines.