Для openSUSE Tumbleweed запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:pbx/openSUSE_Tumbleweed/home:mnhauke:pbx.repo
zypper refresh
zypper install asterisk-calendar
Для openSUSE Leap 15.2 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:pbx/openSUSE_Leap_15.2/home:mnhauke:pbx.repo
zypper refresh
zypper install asterisk-calendar
Для 15.4 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:pbx/15.4/home:mnhauke:pbx.repo
zypper refresh
zypper install asterisk-calendar
Для 15.3 запустите от имени root:
zypper addrepo https://download.opensuse.org/repositories/home:mnhauke:pbx/15.3/home:mnhauke:pbx.repo
zypper refresh
zypper install asterisk-calendar