Express Talk

Express Talk是一款使用SIP协议的免费网络电话软件，可以兼容目前大多数的VoIP电话。它可以穿透NAT和防火墙，提供了呼叫显示、数据压缩、降噪、快速拨号等实用功能。使用前需要先注册一个帐户。

Express Talk is a SIP protocol to use free Internet phone software, can be compatible with most of the VoIP telephone. It can pierce through NAT and firewall, providing call display, data compression, noise reduction, speed dial, utility function. Before using the need to register an account.