Introduction - If you have any usage issues, please Google them yourself
Due to the voice dialogue codec need a free, open source software, so the birth of the Speex library, you can use any open source software. In fact, Speex for voice dialogue is concerned, the equivalent Vorbis [a sound source to be compressed encoding software, open source and free of copyright] For audio/music. Is not the same and most voice codec library, Speex is not designed for mobile phones, but for VOIP (Voice over IP) packet network applications, and supports file-based compression.