o Remove CallController member that we are not using anymore;
o Remove CallController member that we are not using anymore;

o don't mess with UA class internal state, let UA DTRT by itself.

jevonearth/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,dsanders11/rtpproxy,synety-jdebp/rtpproxy,synety-jdebp/rtpproxy,sippy/rtpproxy,sippy/rtp_cluster,jevonearth/rtpproxy,sippy/rtp_cluster,dsanders11/rtpproxy,jevonearth/rtpproxy,jevonearth/rtpproxy,sippy/rtpproxy