Skip to main content


Voice services traditionally relied on circuit-switched (CS) networks or CS fallback. Although these methods have worked in the past, next-gen 5G networks don’t support them. This incompatibility arises due to the fundamental differences in architecture and underlying technologies between 4G and 5G. Therefore, operators must migrate their voice services to Voice over LTE (VoLTE) or Voice over New Radio (VoNR) before offering 5G services.