MarsSeed [1] filed a deletion request for nausoftphone [2]: Defunct, abandoned, unused Qt4 based binary app from 2017.
Upstream seems to no longer provide this VOIP telephony app separately. Instead, it seems to have been integrated into its "Naumen Contact Center" product. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/nausoftphone/
