Seg fault on the server on call

But size of the frames to work on

The codecs are loaded at the initialization of the rtp session and destroyed at the end.
GSM audio quality is far better now. Because the dynamic library had to load at every 20ms the libgsm, it introduced a delay at each frame

Bug correction.
Remove alaw header from git repository.
Add GPL license in ulaw.cpp

!!!!!!!!!!!  Must have libspeex1 and libspeex1-dev installed