Trying to install kannel_1.5.0-0_amd64.deb https://redmine.kannel.org/projects/kannel/files fails and reports the error: kannel depends on libssl0.9.8 (>= 0.9.8m-1); however: Package libssl0.9.8 is not installed.
However, I've got libssl1.1 installed already: libssl-dev is already the newest version (1.1.0f-3+deb9u1). I'm running Debian 9.