Tech Junction Answered question July 13, 2023
There are four Vo5G Solutions:
- Voice over NR (VoNR): The NR-based voice solution is VoNR, the target voice solution of Vo5G.
- EPS Fallback (EPS FB): In the initial 5G network construction phase, the NR coverage is incomplete and the eNodeB is not upgraded. EPS Fallback is used to ensure voice continuity so that 5G subscribers can fall back to the LTE network to use VoLTE services. It is the transitional voice solution for the evolution from VoLTE to VoNR.
- Voice over eLTE (VoeLTE): The NR coverage is limited, and the LTE network needs to be enhanced so that it can access the 5GC network. (The end-to-end solution is not supported currently.)
- RAT Fallback (RAT FB): The NR does not support voice services, and voice services need to fall back to the eLTE network for processing. (The end-to-end solution is not supported currently.)
Tech Junction Edited answer July 13, 2023