Moved re-INVITE cancelling methods to the correct position

Ignore-this: 7e2d1341cd371fc95b13f71485c09a87

darcs-hash:20100204184054-1e3d8-25cd64b205d5b0db7f326ca6d7b8f5b612638e03
Modified the AudioStream to initialize the audio device once it starts

Ignore-this: 342efc80dc8c0f31520663a356f0ec67

darcs-hash:20100205124456-1e3d8-bcea777d233b360815eaeaf592d449aba32de09e