Jitter is the variability in Latency (the time it takes for data packets to reach their destination ). When it comes to VoIP, we’ve found that a delay of 30 milliseconds or greater can result in distortion or calls momentarily dropping-out.

Shorter delays than this won’t result in any appreciable loss of sound quality, but once a delay reaches 30 milliseconds (or 0.03 of a second), it will start to affect the quality of the audio heard at the receiving end.