/usr/share/doc/jscommunicator-web-phone/changelog.Debian.gz is in jscommunicator-web-phone 2.1.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/jscommunicator-web-phone/../libjs-jscommunicator/changelog.Debian.gz