/usr/lib/x86_64-linux-gnu/libosip2.so.11 is in libosip2-11 4.1.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libosip2.so.11.0.0
/usr/lib/x86_64-linux-gnu/libosip2.so.11.0.0