spandsp from home:nxtg_octopus:openSUSE project
Select Your Operating System
Add repository and install manually
For 15.4 run the following as root:
zypper addrepo https://download.opensuse.org/repositories/home:nxtg_octopus:openSUSE/15.4/home:nxtg_octopus:openSUSE.repo zypper refresh zypper install spandsp