MarsSeed [1] filed a deletion request for lib32-libcapi [2]: Abandoned package from 2021. EOL version from 2020. Seems no longer used (0 votes/popularity or reverse dependencies).
Consumer ISDN lines have been shut down all over the world. Therefore AFAICT PC-based ISDN modems cannot be used anymore. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lib32-libcapi/
