Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network:telephony/openSUSE_Tumbleweed/network:telephony.repo
zypper refresh
zypper install libspeex1
Для 15.6 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network:telephony/15.6/network:telephony.repo
zypper refresh
zypper install libspeex1
Для 15.5 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/network:telephony/15.5/network:telephony.repo
zypper refresh
zypper install libspeex1