/usr/lib/x86_64-linux-gnu/libortp.so is in libortp-dev 3.6.1-2.4+b1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libortp.so.9.0.0
/usr/lib/x86_64-linux-gnu/libortp.so.9.0.0