Use binding extension only when the RTPproxy supports 20090810 protocol revision.
Use binding extension only when the RTPproxy supports 20090810 protocol
revision.

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