/usr/lib/x86_64-linux-gnu/libsipXtack.so is in libsipxtapi-dev 3.3.0~test17-2.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libsipXtack.so.1.0.0
/usr/lib/x86_64-linux-gnu/libsipXtack.so.1.0.0