同前一个相比，这个的限制要多一些，不过注册简单，关键是免费的，呵呵，折腾吧。
* Max 300 minutes per week of free calls, measured over the last 7
days. Unused free minutes cannot be taken to the following week(s).
If limit is exceeded, a minimal rate of 1ct/min will be charged (as shown in the VoipDiscount software).
下载地址：
http://www.voipdiscount.com/en/download.html （打开后点击屏幕右边的 Download Now）
setupvoipdiscount.exe 1.78M
拨号的规则
国内：
86+手机号
86+137858XXXXX
很简单的，自己折腾吧。
