1.http://www.cnblogs.com/milospooner/archive/2012/07/13/2590950.html 

2.http://my.oschina.net/sanshang/blog/11151 

3.http://bashell.sinaapp.com/archives/voip-on-android-use-juv-red5-speex-2.html 


4.http://blog.csdn.net/ranxiedao/article/category/1194641 


Skype SILK vs. iLBC vs. Speex 
5.http://blog.csdn.net/annie_229/article/details/6229458