Feature Description
New Radio (NR) is the 5G radio access technology, and Voice over NR (VoNR) is the voice or video over the 5G network. VoNR is the target voice or video communication solution for 5G networks.
Voice services in 5GS over NG-RAN continue to be based on IP Multimedia Subsystem (IMS), such as Voice over LTE (VoLTE). VoNR is supported only when 5GS is connected to the IMS core.
The SMF uses either the DNS proxy or the local configuration defined in P-CSCF profile to resolve the address of P-CSCF server. SMF uses one of the options to resolve the domain name, receive the IP address from the remote DNS servers, and send the IP address to the subscribers.
Note | Local configuration is applicable to both 4G and 5G. |