post-factum [1] filed a deletion request for asterisk-g72x [2]:
This doesn't work for a long time already with new Asterisk versions,
and also won't work with Asterisk 16.
Another package, asterisk-g729, includes G.729 codec that works with
recent Asterisk versions.
Since this package is broken for a long time, and no one cares to
update it, it should be removed. asterisk-g729 should be used instead
for G.729.
[1] https://aur.archlinux.org/account/post-factum/
[2] https://aur.archlinux.org/pkgbase/asterisk-g72x/