/usr/ is in libosip2-dev 4.0.0-3ubuntu2.
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..
/usr/lib/x86_64-linux-gnu/libosip2.a
/usr/lib/x86_64-linux-gnu/
/usr/lib/
/usr/lib/x86_64-linux-gnu/libosipparser2.la
/usr/lib/x86_64-linux-gnu/libosip2.la
/usr/lib/x86_64-linux-gnu/pkgconfig/
/usr/lib/x86_64-linux-gnu/pkgconfig/libosip2.pc
/usr/lib/x86_64-linux-gnu/libosipparser2.a
/usr/include/
/usr/include/osipparser2/
/usr/include/osipparser2/osip_parser.h
/usr/include/osipparser2/osip_body.h
/usr/include/osipparser2/osip_uri.h
/usr/include/osipparser2/sdp_message.h
/usr/include/osipparser2/osip_const.h
/usr/include/osipparser2/osip_port.h
/usr/include/osipparser2/headers/
/usr/include/osipparser2/headers/osip_alert_info.h
/usr/include/osipparser2/headers/osip_authentication_info.h
/usr/include/osipparser2/headers/osip_www_authenticate.h
/usr/include/osipparser2/headers/osip_contact.h
/usr/include/osipparser2/headers/osip_accept_language.h
/usr/include/osipparser2/headers/osip_from.h
/usr/include/osipparser2/headers/osip_via.h
/usr/include/osipparser2/headers/osip_proxy_authorization.h
/usr/include/osipparser2/headers/osip_mime_version.h
/usr/include/osipparser2/headers/osip_cseq.h
/usr/include/osipparser2/headers/osip_error_info.h
/usr/include/osipparser2/headers/osip_route.h
/usr/include/osipparser2/headers/osip_call_info.h
/usr/include/osipparser2/headers/osip_accept.h
/usr/include/osipparser2/headers/osip_to.h
/usr/include/osipparser2/headers/osip_content_disposition.h
/usr/include/osipparser2/headers/osip_accept_encoding.h
/usr/include/osipparser2/headers/osip_content_length.h
/usr/include/osipparser2/headers/osip_content_type.h
/usr/include/osipparser2/headers/osip_allow.h
/usr/include/osipparser2/headers/osip_proxy_authentication_info.h
/usr/include/osipparser2/headers/osip_call_id.h
/usr/include/osipparser2/headers/osip_authorization.h
/usr/include/osipparser2/headers/osip_proxy_authenticate.h
/usr/include/osipparser2/headers/osip_content_encoding.h
/usr/include/osipparser2/headers/osip_header.h
/usr/include/osipparser2/headers/osip_record_route.h
/usr/include/osipparser2/osip_md5.h
/usr/include/osipparser2/osip_message.h
/usr/include/osipparser2/osip_list.h
/usr/include/osipparser2/osip_headers.h
/usr/include/osip2/
/usr/include/osip2/osip_mt.h
/usr/include/osip2/osip_dialog.h
/usr/include/osip2/osip_time.h
/usr/include/osip2/osip_condv.h
/usr/include/osip2/osip_fifo.h
/usr/include/osip2/osip.h
/usr/share/
/usr/share/man/
/usr/share/man/man1/
/usr/share/man/man1/osip.1.gz
/usr/share/doc/
/usr/share/doc/libosip2-dev/
/usr/share/doc/libosip2-dev/README
/usr/share/doc/libosip2-dev/README.Debian
/usr/share/doc/libosip2-dev/TODO
/usr/share/doc/libosip2-dev/copyright
/usr/share/doc/libosip2-dev/NEWS.gz
/usr/share/doc/libosip2-dev/BUGS
/usr/lib/x86_64-linux-gnu/libosip2.so
/usr/lib/x86_64-linux-gnu/libosipparser2.so
/usr/share/doc/libosip2-dev/changelog.Debian.gz