/usr/include/openh323/h460/ is in libh323plus-dev 1.24.0~dfsg2-1+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/openh323/h460/h460.h
/usr/include/openh323/h460/h4601.h
/usr/include/openh323/h460/h46015.h
/usr/include/openh323/h460/h46017a.h
/usr/include/openh323/h460/h46018.h
/usr/include/openh323/h460/h46018_h225.h
/usr/include/openh323/h460/h46019.h
/usr/include/openh323/h460/h46024b.h
/usr/include/openh323/h460/h4609.h
/usr/include/openh323/h460/h460_oid3.h
/usr/include/openh323/h460/h460_std17.h
/usr/include/openh323/h460/h460_std18.h
/usr/include/openh323/h460/h460_std23.h
/usr/include/openh323/h460/h460_std9.h
/usr/include/openh323/h460/h460p.h
/usr/include/openh323/h460/h460pres.h
/usr/include/openh323/h460/h460tm.h
/usr/include/openh323/h460/upnpcp.h