[nick_name]

For VoIP applications, one-way mouth-to-ear delay should ideally be less than 150 ms for natural conversations [1].

Other factors, such as jitter, transmission delay, queuing delay, etc., also impact quality. However, if the delay occurs mid-transmission (e.g., due to network congestion or routing inefficiencies), there’s little that can be done beyond optimizing at the endpoints.

[1] https://www.wikiwand.com/en/articles/Latency_(audio)#Telepho...