/usr/lib/x86_64-linux-gnu/libmediastreamer_voip.so.3 is in libmediastreamer-base3 3.6.1-2.1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libmediastreamer_voip.so.3.0.0