Starshop or any other call shop software for that matter

anyone knows of a good call shop os software? ive searched, only found starshop
however, i’ve unsuccesfully tried to get starshop working. ( its installed, its running, it displays the number called, but thats about it. the BILIING part, the important one, doesnt happen

if anyone has any other open source working option for call shops, or a working config of starshop, plz reply!